In late 1917, most of the Heavy and Siege Batteries of the Royal Garrison Artillery were transferred to come under orders of a Heavy Artillery Group with which they then remained. Before this, they had frequently been transferred from Group to Group. Heavy Artillery Groups became known as RGA Brigades from 17 December 1917, but it appears that the two terms were used almost interchangeably. The tables below show which batteries came under which groups/brigades from late 1917 onwards.
For the period before that covered on this page, I suggest that you refer to the useful documents “Allocations of Heavy Batteries RGA” and “Allocations of Siege Batteries RGA”, which form part of the WO95/5494 collection at the National Archives. At least, until such time that I add the earlier details to The Long, Long Trail. These documents form the basis for the information provided on this page.
Research tip
If you are researching a man of the Royal Garrison Artillery it can be most difficult to determine the battery or batteries with which he served. In most cases, it will only be if his service or pension record has survived or if he lost his life that this detail will be found. And then … most of these batteries no longer have a surviving war diary to enable you to find out where he was and the actions in which he was involved.
Key to making progress is to determine the Heavy Artillery Group (or RGA Brigade) that commanded his battery. The tables below will help you do that. The war diaries of these group do, in general, survive. Locating them in the National Archives catalogue can be tricky, but it is good practice to begin by using the word “Brigade” rather than “Group”. An example of how this has been treated is shown below.
The batteries under command of each Heavy Artillery Group/RGA Brigade
| HAG/RGA Brigade | Batteries under orders of the HGA in late December 1917 and afterwards. (See battery list further down this page for any later transfers) | Notes All HAG in France and Flanders unless mentioned |
|---|---|---|
| 1st HAG | 14th Heavy Battery 16th Heavy Battery 21st Heavy Battery 49th Siege Battery 254th Siege Battery 479th Siege Battery | |
| 2nd HAG | 66th Siege Battery 177th Siege Battery 250th Siege Battery 352nd Siege Battery | |
| 3rd HAG | 48th Heavy Battery 112th Heavy Battery 21st Siege Battery 88th Siege Battery 152nd Siege Battery 268th Siege Battery | |
| 4th HAG | 2/1st North Midland Heavy Battery 131st Heavy Battery 129th Siege Battery 207th Siege Battery 261st Siege Battery 301st Siege Battery | |
| 5th HAG | 47th Siege Battery 160th Siege Battery 200th Siege Battery 295th Siege Battery 374th Siege Battery | |
| 6th HAG | 109th Heavy Battery 114th Heavy Battery 42nd Siege Battery 111th Siege Battery 227th Siege Battery 245th Siege Battery | |
| 7th HAG | 115th Heavy Battery 125th Heavy Battery 27th Siege Battery 28th Siege Battery 158th Siege Battery 193rd Siege Battery | |
| 8th HAG | 90th Siege Battery 235th Siege Battery 243rd Siege Battery 290th Siege Battery | |
| 9th HAG | 128th Heavy Battery 130th Heavy Battery 153rd Siege Battery | |
| 10th HAG | 150th Heavy Battery 159th Heavy Battery 113th Siege Battery 226th Siege Battery | |
| 11th HAG | 80th Siege Battery 104th Siege Battery 359th Siege Battery 393rd Siege Battery | |
| 12th HAG | 29th Siege Battery 70th Siege Battery 242nd Siege Battery 263rd Siege Battery 319th Siege Battery | |
| 13th HAG | 22nd Heavy Battery 1/2nd London Heavy Battery | |
| 14th HAG | 150th Siege Battery 214th Siege Battery 296th Siege Battery | |
| 15th HAG | 155th Heavy Battery 171st Siege Battery 197th Siege Battery 302nd Siege Battery 307th Siege Battery | Italy |
| 16th HAG | 23rd Heavy Battery 146th Heavy Battery 204th Siege Battery 280th Siege Battery | |
| 17th HAG | 135th Heavy Battery 2/1st Lancashire Heavy Battery 13th Siege Battery 51st Siege Battery 248th Siege Battery | |
| 18th HAG | 152nd Heavy Battery 117th Siege Battery 180th Siege Battery 218th Siege Battery 236th Siege Battery | |
| 19th HAG | 138th Heavy Battery 140th Heavy Battery 46th Siege Battery 258th Siege Battery 297th Siege Battery 321st Siege Battery | |
| 20th HAG | 20th Heavy Battery 143rd Heavy Battery 153rd Heavy Battery 180th Heavy Battery 127th Siege Battery | Salonika |
| 21st HAG | 71st Heavy Battery 1/2nd Lancashire Heavy Battery 24th Siege Battery 354th Siege Battery | |
| 22nd HAG | 182nd Siege Battery 253rd Siege Battery 265th Siege Battery 287th Siege Battery | |
| 23rd HAG | 94th Siege Battery 256th Siege Battery 327th Siege Battery 354th Siege Battery | |
| 24th HAG | 24th Heavy Battery 1/1st Warwickshire Heavy Battery 172nd Siege Battery 229th Siege Battery 247th Siege Battery | Italy |
| 25th HAG | 18th Siege Battery 83rd Siege Battery 85th Siege Battery 363rd Siege Battery 409th Siege Battery 434th Siege Battery | |
| 26th HAG | 52nd Siege Battery 64th Siege Battery 444th Siege Battery 456th Siege Battery | |
| 27th HAG | 25th Heavy Battery 144th Heavy Battery 33rd Siege Battery 110th Siege Battery 216th Siege Battery | |
| 28th HAG | 1/1st West Riding Heavy Battery 117th Heavy Battery 141st Siege Battery 148th Siege Battery 213th Siege Battery 329th Siege Battery | |
| 29th HAG | 12th Heavy Battery 121st Heavy Battery 195th Siege Battery 303rd Siege Battery | |
| 30th HAG | 23rd Siege Battery 39th Siege Battery 241st Siege Battery 308th Siege Battery | |
| 32nd HAG | 26th Siege Battery 103rd Siege Battery | |
| 33rd HAG | 31st Siege Battery 221st Siege Battery 279th Siege Battery 298th Siege Battery | |
| 34th HAG | 48th Siege Battery 112th Siege Battery 142nd Siege Battery 278th Siege Battery 431st Siege Battery | |
| 35th HAG | 111th Heavy Battery 145th Heavy Battery 170th Siege Battery 267th Siege Battery | |
| 36th HAG | 151st Heavy Battery 54th (Australian) Siege Battery 55th (Australian) Siege Battery 353rd Siege Battery | |
| 37th HAG | 18th Heavy Battery 130th Siege Battery 132nd Siege Battery | Salonika |
| 38th HAG | 384th Siege Battery 387th Siege Battery | Mesopotamia. Also known as III Indian Corps Siege Artillery Brigade D Group. |
| 39th HAG | 133rd Siege Battery 199th Siege Battery 206th Siege Battery 266th Siege Battery 281st Siege Battery | |
| 40th HAG | 40th Siege Battery 186th Siege Battery | |
| 41st HAG | 1/1st North Midland Heavy Battery 1/1st Northumbrian (North Riding) Heavy Battery 1st Siege Battery 41st Siege Battery 155th Siege Battery | |
| 42nd HAG | 1/1st London Heavy Battery 323rd Siege Battery | |
| 43rd HAG | 147th Siege Battery 154th Siege Battery 190th Siege Battery 351st Siege Battery | |
| 44th HAG | 20th Siege Battery 71st (South African) Siege Battery 73rd (South African) Siege Battery | |
| 45th HAG | 32nd Siege Battery 38th Siege Battery 62nd Siege Battery 208th Siege Battery | |
| 46th HAG | 108th Heavy Battery 1/1st Lancashire Heavy Battery 4th Siege Battery 5th Siege Battery | |
| 47th HAG | 109th Siege Battery 146th Siege Battery 156th Siege Battery 309th Siege Battery | |
| 48th HAG | 133rd Heavy Battery 147th Heavy Battery 59th Siege Battery 81st Siege Battery | |
| 49th HAG | 129th Heavy Battery 99th Siege Battery 166th Siege Battery 346th Siege Battery | |
| 50th HAG | 72nd (South African) Siege Battery 74th (South African) Siege Battery 75th (South African) Siege Battery 77th Siege Battery 275th Siege Battery | |
| 51st HAG | 137th Heavy Battery 89th Siege Battery 161st Siege Battery 169th Siege Battery 255th Siege Battery 283rd Siege Battery | |
| 52nd HAG | 10th Siege Battery 164th Siege Battery 259th Siege Battery 264th Siege Battery | |
| 53rd HAG | 136th Heavy Battery 1/1st Welsh Heavy Battery 188th Siege Battery 249th Siege Battery 251st Siege Battery 252nd Siege Battery | |
| 54th HAG | 173rd Siege Battery | |
| 55th HAG | 53rd Siege Battery 189th Siege Battery 192nd Siege Battery | |
| 56th HAG | 106th Siege Battery 144th Siege Battery 175th Siege Battery 220th Siege Battery | |
| 58th HAG | 58th Siege Battery 442nd Siege Battery | |
| 59th HAG | 30th Siege Battery 37th Siege Battery 335th Siege Battery 350th Siege Battery 375th Siege Battery | |
| 60th HAG | 136th Siege Battery 183rd Siege Battery 305th Siege Battery 342nd Siege Battery | |
| 61st HAG | 138th Siege Battery 205th Siege Battery | Egypt and Palestine |
| 62nd HAG | 122nd Heavy Battery 126th Heavy Battery 67th Siege Battery 76th Siege Battery 223rd Siege Battery 224th Siege Battery 274th Siege Battery | |
| 63rd HAG | 38th Heavy Battery 119th Heavy Battery 1/1st Wessex Heavy Battery 86th Siege Battery | |
| 64th HAG | 61st Siege Battery 100th Siege Battery 101st Siege Battery 102nd Siege Battery | |
| 65th HAG | 115th Siege Battery 202nd Siege Battery 212th Siege Battery | |
| 66th HAG | 120th Siege Battery 122nd Siege Battery 306th Siege Battery 325th Siege Battery | |
| 67th HAG | 17th Heavy Battery 110th Heavy Battery 79th Siege Battery 125th (South African) Siege Battery 149th Siege Battery 162nd Siege Battery 234th Siege Battery 450th Siege Battery | |
| 68th HAG | 25th Siege Battery 114th Siege Battery 166th Siege Battery 211th Siege Battery | |
| 69th HAG | 93rd Siege Battery 238th Siege Battery 291st Siege Battery 331st Siege Battery | |
| 70th HAG | 12th Siege Battery 15th Siege Battery 157th Siege Battery 217th Siege Battery | |
| 71st HAG | 9th Siege Battery 17th Siege Battery 126th Siege Battery 332nd Siege Battery | |
| 73rd HAG | 65th Siege Battery 330th Siege Battery 381st Siege Battery | |
| 75th HAG | 190th Heavy Battery | Salonika |
| 76th HAG | 113th Heavy Battery 132nd Heavy Battery 19th Siege Battery 91st Siege Battery 228th Siege Battery 233rd Siege Battery | |
| 77th HAG | 9th Heavy Battery 26th Heavy Battery 116th Siege Battery 119th Siege Battery 191st Siege Battery 286th Siege Battery | |
| 78th HAG | 36th Siege Battery 87th Siege Battery 108th Siege Battery 139th Siege Battery | |
| 79th HAG | 142nd Heavy Battery 1/1st Essex Heavy Battery 14th Siege Battery 145th Siege Battery 174th Siege Battery 185th Siege Battery 187th Siege Battery 222nd Siege Battery | |
| 80th HAG | 90th Heavy Battery 137th Siege Battery 176th Siege Battery 181st Siege Battery 289th Siege Battery | Italy |
| 81st HAG | 31st Heavy Battery 1/1st Lowland Heavy Battery 163rd Siege Battery 179th Siege Battery 184th Siege Battery 239th Siege Battery | |
| 82nd HAG | 185th Heavy Battery 192nd Heavy Battery 196th Heavy Battery 82nd Siege Battery | Salonika |
| 83rd HAG | 116th Heavy Battery 1/1st Highland Heavy Battery 69th Siege Battery 135th Siege Battery 230th Siege Battery 284th Siege Battery | |
| 84th HAG | 34th Siege Battery 276th Siege Battery 336th Siege Battery | |
| 85th HAG | 120th Heavy Battery 139th Heavy Battery 2nd Siege Battery 3rd Siege Battery 124th Siege Battery 196th Siege Battery | |
| 86th HAG | 141st Heavy Battery 203rd Siege Battery 324th Siege Battery | |
| 87th HAG | 154th Heavy Battery 156th Heavy Battery 44th Siege Battery 194th Siege Battery 219th Siege Battery | |
| 88th HAG | 78th Siege Battery 123rd Siege Battery 328th Siege Battery | |
| 89th HAG | 56th Siege Battery 57th Siege Battery 68th Siege Battery 178th Siege Battery 225th Siege Battery 237th Siege Battery | |
| 90th HAG | 95th Siege Battery 244th Siege Battery 262nd Siege Battery 277th Siege Battery 299th Siege Battery | |
| 91st HAG | 96th Siege Battery 140th Siege Battery 326th Siege Battery 337th Siege Battery | |
| 92nd HAG | 127th Heavy Battery 2/1st Lowland Heavy Battery | |
| 93rd HAG | 35th Heavy Battery 50th Siege Battery 215th Siege Battery 232nd Siege Battery | |
| 94th HAG | 315th Siege Battery 316th Siege Battery 317th Siege Battery | Italy |
| 95th HAG | 304th Siege Battery 314th Siege Battery 320th Siege Battery 322nd Siege Battery 334th Siege Battery | Egypt and Palestine |
| 96th HAG | 10th Heavy Battery 91st Heavy Battery 300th Siege Battery 378th Siege Battery 383rd Siege Battery 440th Siege Battery | Egypt and Palestine |
| 97th HAG | 195th Heavy Battery 201st Siege Battery 292nd Siege Battery 379th Siege Battery 420th Siege Battery 421st Siege Battery 422nd Siege Battery | Egypt and Palestine |
| 98th HAG | 121st Siege Battery 143rd Siege Battery 210th Siege Battery 270th Siege Battery 294th Siege Battery | |
| 99th HAG | 151st Siege Battery 282nd Siege Battery 285th Siege Battery 405th Siege Battery | |
| 100th HAG | 15th Heavy Battery 181st Heavy Battery 134th Siege Battery 209th Siege Battery | Egypt and Palestine |
| 101st HAG | 395th Siege Battery 396th Siege Battery | Mesopotamia |
| 102nd HAG | 189th Heavy Battery 202nd Heavy Battery 380th Siege Battery | Egypt and Palestine |
| 103rd HAG | 390th Siege Battery 391st Siege Battery 443rd Siege Battery | Egypt and Palestine |
| 104th HAG | 19th Heavy Battery 240th Siege Battery 293rd Siege Battery | Italy |
| 2nd Canadian HAG | 1st Canadian Heavy Battery 2nd Canadian Heavy Battery |
The Heavy Artillery Group/RGA Brigade under which each Heavy Battery came
| RGA Heavy Battery | HAG/RGA Brigade under whose orders it came in late December 1917 (and remained so unless mentioned in notes) | Notes All batteries in France and Flanders unless mentioned |
|---|---|---|
| 9th Heavy Battery | 77th HAG | |
| 10th Heavy Battery | 96th HAG | Egypt and Palestine. Moved to 103rd HAG July 1918 |
| 11th Heavy Battery | East Africa. Returned home January 1918 and became 545th Siege Battery | |
| 12th Heavy Battery | 29th HAG | |
| 13th Heavy Battery | 75th HAG | Salonika. Moved to 61st HAG September 1918 |
| 14th Heavy Battery | 1st HAG | Moved to 92nd HAG January 1918 |
| 15th Heavy Battery | 100th HAG | Egypt and Palestine |
| 16th Heavy Battery | 1st HAG | |
| 17th Heavy Battery | 67th HAG | |
| 18th Heavy Battery | 37th HAG | Salonika. Moved to 61st HAG September 1918 |
| 19th Heavy Battery | 104th HAG | Italy |
| 20th Heavy Battery | 37th HAG | Salonika. Some later changes. Refer to “Allocations” for details. |
| 21st Heavy Battery | 1st HAG | |
| 22nd Heavy Battery | 13th HAG | |
| 23rd Heavy Battery | 16th HAG | |
| 24th Heavy Battery | 18th HAG | Some later changes. Refer to “Allocations” for details. |
| 25th Heavy Battery | 27th HAG | |
| 26th Heavy Battery | 77th HAG | |
| 27th to 30th Heavy Battery | ? | |
| 31st Heavy Battery | 81st HAG | Some later changes. Refer to “Allocations” for details. |
| 32nd to 34th Heavy Battery | ? | |
| 35th Heavy Battery | 93rd HAG | |
| 36th to 37th Heavy Battery | ? | |
| 38th Heavy Battery | 63rd HAG | |
| 39th to 47th Heavy Battery | ? | |
| 48th Heavy Battery | 3rd HAG | |
| 49th to 70th Heavy Battery | ? | |
| 71st Heavy Battery | 21st HAG | |
| 72nd Heavy Battery | Mesopotamia | |
| 73rd to 76th Heavy Battery | ? | |
| 77th Heavy Battery | Mesopotamia | |
| 2/86th Heavy Battery | Mesopotamia | |
| 90th Heavy Battery | 80th HAG | Italy |
| 91st Heavy Battery | 96th HAG | Egypt and Palestine |
| 104th Heavy Battery | Mesopotamia. Possibly called 2/104th | |
| 105th to 107th Heavy Battery | ? | |
| 108th Heavy Battery | 46th HAG | |
| 109th Heavy Battery | 6th HAG | |
| 110th Heavy Battery | 67th HAG | |
| 111th Heavy Battery | 35th HAG | |
| 112th Heavy Battery | 3rd HAG | |
| 113th Heavy Battery | 76th HAG | |
| 114th Heavy Battery | 6th HAG | |
| 115th Heavy Battery | 7th HAG | |
| 116th Heavy Battery | 83rd HAG | |
| 117th Heavy Battery | 28th HAG | |
| 118th Heavy Battery | Battery no longer existed | |
| 119th Heavy Battery | 63rd HAG | |
| 120th Heavy Battery | 85th HAG | |
| 121st Heavy Battery | 29th HAG | |
| 122nd Heavy Battery | 62nd HAG | Temporarily attached to 68th HAG until rejoining 62nd in January 1918 |
| 123rd Heavy Battery | Battery no longer existed | |
| 124th Heavy Battery | Not allocated to HAG in late December 1917. Some later changes. Refer to “Allocations” for details. | |
| 125th Heavy Battery | 7th HAG | |
| 126th Heavy Battery | 62nd HAG | Temporarily attached to 68th HAG until rejoining 62nd in January 1918 |
| 127th Heavy Battery | 92nd HAG | |
| 128th Heavy Battery | 9th HAG | Temporarily at Second Army Artillery School until rejoining HAG in January 1918 |
| 129th Heavy Battery | 49th HAG | Moved to 92nd HAG January 1918 |
| 130th Heavy Battery | 9th HAG | |
| 131st Heavy Battery | 4th HAG | |
| 132nd Heavy Battery | 76th HAG | |
| 133rd Heavy Battery | 48th HAG | |
| 134th Heavy Battery | East Africa | |
| 135th Heavy Battery | 17th HAG | |
| 136th Heavy Battery | 53rd HAG | |
| 137th Heavy Battery | 51st HAG | |
| 138th Heavy Battery | 19th HAG | Moved to 51st HAG January 1918 |
| 139th Heavy Battery | 85th HAG | |
| 140th Heavy Battery | 19th HAG | Moved to 36th HAG January 1918 |
| 141st Heavy Battery | 86th HAG | |
| 142nd Heavy Battery | 79th HAG | |
| 143rd Heavy Battery | 20th HAG | Salonika. Moved to 37th HAG September 1918 |
| 144th Heavy Battery | 27th HAG | |
| 145th Heavy Battery | 35th HAG | |
| 146th Heavy Battery | 16th HAG | |
| 147th Heavy Battery | 48th HAG | |
| 148th and 149th Heavy Batteries | Batteries no longer existed | |
| 150th Heavy Battery | 10th HAG | |
| 151st Heavy Battery | 36th HAG | |
| 152nd Heavy Battery | 18th HAG | Some later changes. Refer to “Allocations” for details. |
| 153rd Heavy Battery | 20th HAG | Salonika |
| 154th Heavy Battery | 87th HAG | Some later changes. Refer to “Allocations” for details. |
| 155th Heavy Battery | 15th HAG | Italy. Some later changes. Refer to “Allocations” for details. |
| 156th Heavy Battery | 87th HAG | |
| 157th Heavy Battery | Mesopotamia | |
| 158th Heavy Battery | East Africa. Called 14th Howitzer Battery from May 1916 | |
| 159th Heavy Battery | 10th HAG | |
| 160th to 176th Heavy Batteries | Batteries no longer existed | |
| 177th Heavy Battery | Mesopotamia | |
| 178th Heavy Battery | ? | |
| 179th Heavy Battery | > | |
| 180th Heavy Battery | 20th HAG | Salonika |
| 181st Heavy Battery | 100th HAG | Some later changes. Refer to “Allocations” for details. |
| 182nd to 184th Heavy Batteries | Batteries no longer existed | |
| 185th Heavy Battery | 82nd HAG | Salonika. Moved to 20th HAG September 1918 |
| 186th Heavy Battery | ? | |
| 187th Heavy Battery | ? | |
| 188th Heavy Battery | Salonika. Not allocated to HAG | |
| 189th Heavy Battery | 102nd HAG | Egypt and Palestine |
| 190th Heavy Battery | 75th HAG | Salonika. Some later changes. Refer to “Allocations” for details. |
| 191st Heavy Battery | Battery no longer existed | |
| 192nd Heavy Battery | 82nd HAG | Salonika. Some later changes. Refer to “Allocations” for details. |
| 193rd and 194th Heavy Batteries | Batteries no longer existed | |
| 195th Heavy Battery | 97th HAG | Egypt and Palestine. Some later changes. Refer to “Allocations” for details. |
| 196th Heavy Battery | 82nd HAG | Salonika |
| 197th to 201st Heavy Batteries | Batteries no longer existed | |
| 202nd Heavy Battery | 102nd HAG | Egypt and Palestine. Some later changes. Refer to “Allocations” for details. |
| 203rd Heavy Battery | Battery no longer existed | |
| 1/1st Highland Heavy Battery | 83rd HAG | Territorial Force unit |
| 1/1st Lowland Heavy Battery | 81st HAG | Territorial Force unit |
| 2/1st Lowland Heavy Battery | 92nd HAG | Territorial Force unit. Moved to 93rd HAG January 1918 |
| 1/1st West Riding Heavy Battery | 28th HAG | Territorial Force unit |
| 1/1st London Heavy Battery | 42nd HAG | Territorial Force unit. Refer to “Allocations” for details of later changes. |
| 1/2nd London Heavy Battery | 13th HAG | Territorial Force unit |
| 1/1st Welsh Heavy Battery | 53rd HAG | Territorial Force unit |
| 1/1st Warwickshire Heavy Battery | 24th HAG | Italy. Territorial Force unit |
| 1/1st North Midland Heavy Battery | 41st HAG | Territorial Force unit |
| 2/1st North Midland Heavy Battery | 4th HAG | Territorial Force unit |
| 1/1st Essex Heavy Battery | 79th HAG | Territorial Force unit |
| 1/1st Kent Heavy Battery | Territorial Force unit. In GHQ Reserve, not allocated to HAG, in late December 1917. Moved to 92nd HAG January 1918 | |
| 1/1st Northumbrian (North Riding) Heavy Battery | 41st HAG | Territorial Force unit |
| 1/1st Wessex Heavy Battery | 63rd HAG | Territorial Force unit. Moved to 86th HAG January 1918 |
| 1/1st Lancashire Heavy Battery | 46th HAG | Territorial Force unit. Temporarily attached to 79th HAG until January 1918 |
| 2/1st Lancashire Heavy Battery | 17th HAG | Territorial Force unit |
| 1/2nd Lancashire Heavy Battery | 21st HAG | Territorial Force unit |
| 1st Canadian Heavy Battery | 2nd Canadian HAG | Canadian Corps |
| 2nd Canadian Heavy Battery | 2nd Canadian HAG | Canadian Corps |
The Heavy Artillery Group/RGA Brigade under which each Siege Battery came
| RGA Siege Battery | HAG/RGA Brigade under whose orders it came in late December 1917 (and remained so unless mentioned in notes) | Notes All batteries in France and Flanders unless mentioned |
|---|---|---|
| 1st Siege Battery | 41st HAG | |
| 2nd Siege Battery | 85th HAG | |
| 3rd Siege Battery | 85th HAG | |
| 4th Siege Battery | 46th HAG | |
| 5th Siege Battery | 46th HAG | |
| 8th Siege Battery | Not under a HAG. Third Army. | |
| 9th Siege Battery | 71st HAG | |
| 10th Siege Battery | 52nd HAG | |
| 11th Siege Battery | At Fifth Army Artillery School. Joined 14th HAG in January 1918 | |
| 12th Siege Battery | 70th HAG | |
| 13th Siege Battery | 17th HAG | |
| 14th Siege Battery | 79th HAG | |
| 15th Siege Battery | 70th HAG | |
| 16th Siege Battery | In GHQ Reserve until joining 8th HAG in January 1918 | |
| 17th Siege Battery | 71st HAG | |
| 18th Siege Battery | 25th HAG | Railway Guns. Numerous changes. Refer to “Allocations” for details. |
| 19th Siege Battery | 76th HAG | |
| 20th Siege Battery | 44th HAG | |
| 21st Siege Battery | 3rd HAG | |
| 22nd Siege Battery | Railway Guns. Not under a HAG after January 1918 | |
| 23rd Siege Battery | 30th HAG | |
| 24th Siege Battery | 21st HAG | |
| 25th Siege Battery | 68th HAG | |
| 26th Siege Battery | 32nd HAG | |
| 27th Siege Battery | 7th HAG | |
| 28th Siege Battery | 7th HAG | |
| 29th Siege Battery | 12th HAG | Left for 31st HAG January 1918. Refer to “Allocations” for details. |
| 30th Siege Battery | 59th HAG | |
| 31st Siege Battery | 33rd HAG | |
| 32nd Siege Battery | 45th HAG | |
| 33rd Siege Battery | 27th HAG | |
| 34th Siege Battery | 84th HAG | |
| 35th Siege Battery | Not allotted to a HAG. Refer to “Allocations” for details of later changes. | |
| 36th Siege Battery | 78th HAG | |
| 37th Siege Battery | 59th HAG | |
| 38th Siege Battery | 45th HAG | |
| 39th Siege Battery | 30th HAG | |
| 40th Siege Battery | 40th HAG | |
| 41st Siege Battery | 23rd HAG | |
| 42nd Siege Battery | 6th HAG | |
| 43rd Siege Battery | Battery no longer existed | |
| 44th Siege Battery | 87th HAG | Railway Guns. Numerous changes. Refer to “Allocations” for details. |
| 45th Siege Battery | 2 Railway Guns. Battery no longer operated as a single unit until Feb 1918. Refer to “Allocations” for details. | |
| 46th Siege Battery | 19th HAG | |
| 47th Siege Battery | 5th HAG | |
| 48th Siege Battery | 34th HAG | |
| 49th Siege Battery | 1st HAG | |
| 50th Siege Battery | 93rd HAG | Moved to Fourth Army, not allotted to a HAG, February 1918 |
| 51st Siege Battery | 17th HAG | |
| 52nd Siege Battery | 26th HAG | |
| 53rd Siege Battery | 55th HAG | |
| 54th (Australian) Siege Battery | 36th HAG | |
| 55th (Australian) Siege Battery | 36th HAG | |
| 56th Siege Battery | 89th HAG | Numerous changes. Refer to “Allocations” for details. |
| 57th Siege Battery | 89th HAG | Numerous changes. Refer to “Allocations” for details. |
| 58th Siege Battery | 58th HAG | Numerous changes. Refer to “Allocations” for details. |
| 59th Siege Battery | 48th HAG | |
| 60th Siege Battery | Sections operating separately. Refer to “Allocations” for details. | |
| 61st Siege Battery | 64th HAG | |
| 62nd Siege Battery | 45th HAG | Some later changes. Refer to “Allocations” for details. |
| 63rd Siege Battery | 2 railway Guns. Not allotted to HAG in late 1917. Some later changes. Refer to “Allocations” for details. | |
| 64th Siege Battery | 26th HAG | 2 Railway Guns. Moved to 55th HAG 1 March 1918. |
| 65th Siege Battery | 73rd HAG | Some later changes. Refer to “Allocations” for details. |
| 66th Siege Battery | 2nd HAG | |
| 67th Siege Battery | 62nd HAG | |
| 68th Siege Battery | 89th HAG | |
| 69th Siege Battery | 83rd HAG | |
| 70th Siege Battery | 12th HAG | |
| 71st (South African) Siege Battery | 44th HAG | |
| 72nd (South African) Siege Battery | 50th HAG | |
| 73rd (South African) Siege Battery | 44th HAG | |
| 74th (South African) Siege Battery | 50th HAG | |
| 75th (South African) Siege Battery | 50th HAG | |
| 76th Siege Battery | 62nd HAG | Some later changes. Refer to “Allocations” for details. |
| 77th Siege Battery | 50th HAG | Moved to 84th HAG 2 January 1918 |
| 78th Siege Battery | 88th HAG | |
| 79th Siege Battery | 67th HAG | |
| 80th Siege Battery | 11th HAG | Some later changes. Refer to “Allocations” for details. |
| 81st Siege Battery | 48th HAG | |
| 82nd Siege Battery | 51st HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 83rd Siege Battery | 25th HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 84th Siege Battery | Salonika. | |
| 85th Siege Battery | 25th HAG | Some later changes. Refer to “Allocations” for details. |
| 86th Siege Battery | 63rd HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 87th Siege Battery | 78th HAG | |
| 88th Siege Battery | 3rd HAG | |
| 89th Siege Battery | 51st HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 90th Siege Battery | 8th HAG | |
| 91st Siege Battery | 76th HAG | |
| 92nd Siege Battery | 2 Railway Guns. Not allotted to HAG in late December 19176. Some later changes. Refer to “Allocations” for details. | |
| 93rd Siege Battery | 69th HAG | |
| 94th Siege Battery | 23rd HAG | |
| 95th Siege Battery | 90th HAG | |
| 96th Siege Battery | 91st HAG | |
| 97th (Canadian) Siege Battery | Renamed 1st Canadian Siege Battery in 1917 | |
| 98th (Canadian) Siege Battery | Renamed 2nd Canadian Siege Battery in 1917 | |
| 99th Siege Battery | 49th HAG | |
| 100th Siege Battery | 64th HAG | |
| 101st Siege Battery | 64th HAG | |
| 102nd Siege Battery | 64th HAG | |
| 103rd Siege Battery | 32nd HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 104th Siege Battery | 11th HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 105th Siege Battery | Italy | |
| 106th Siege Battery | 56th HAG | |
| 107th (Canadian) Siege Battery | Renamed 3rd Canadian Siege Battery in 1917 | |
| 108th Siege Battery | 78th HAG | |
| 109th Siege Battery | 47th HAG | |
| 110th Siege Battery | 27th HAG | |
| 111th Siege Battery | 6th HAG | |
| 112th Siege Battery | 34th HAG | |
| 113th Siege Battery | 10th HAG | |
| 114th Siege Battery | 68th HAG | |
| 115th Siege Battery | 65th HAG | |
| 116th Siege Battery | 77th HAG | |
| 117th Siege Battery | 18th HAG | |
| 118th Siege Battery | Not allocated to HAG in late December 1917. Some later changes. Refer to “Allocations” for details. | |
| 119th Siege Battery | 77th HAG | |
| 120th Siege Battery | 66th HAG | |
| 121st Siege Battery | 98th HAG | |
| 122nd Siege Battery | 66th HAG | |
| 123rd Siege Battery | 88th HAG | |
| 124th Siege Battery | 85th HAG | Moved to 93rd HAG February 1918 |
| 125th (South African) Siege Battery | 67th HAG | Moved to 44th HAG 9 January 1918 |
| 126th Siege Battery | 71st HAG | |
| 127th Siege Battery | 20th HAG | Moved to 61st HAG October 1918 |
| 128th Siege Battery | 2 Railway Guns, Not allotted to HAG | |
| 129th Siege Battery | 4th HAG | |
| 130th Siege Battery | 37th HAG | Salonika. Moved to 75th HAG October 1918 |
| 131st (Canadian) Siege Battery | Renamed 4th Canadian Siege Battery in 1917 | |
| 132nd Siege Battery | 37th HAG | Salonika. Some later changes. Refer to “Allocations” for details. |
| 133rd Siege Battery | 39th HAG | |
| 134th Siege Battery | 100th HAG | Egypt and Palestine. Moved to 97th HAG October 1918 |
| 135th Siege Battery | 83rd HAG | |
| 136th Siege Battery | 60th HAG | |
| 137th Siege Battery | 80th HAG | Italy |
| 138th Siege Battery | 61st HAG | |
| 139th Siege Battery | 78th HAG | |
| 140th Siege Battery | 91st HAG | |
| 141st Siege Battery | 28th HAG | |
| 142nd Siege Battery | 34th HAG | |
| 143rd Siege Battery | 98th HAG | Some later changes. Refer to “Allocations” for details. |
| 144th Siege Battery | 56th HAG | |
| 145th Siege Battery | 79th HAG | Some later changes. Refer to “Allocations” for details. |
| 146th Siege Battery | 47th HAG | |
| 147th Siege Battery | 43rd HAG | |
| 148th Siege Battery | 28th HAG | |
| 149th Siege Battery | 67th HAG | |
| 150th Siege Battery | 14th HAG | |
| 151st Siege Battery | 99th HAG | |
| 152nd Siege Battery | 3rd HAG | |
| 153rd Siege Battery | 9th HAG | |
| 154th Siege Battery | 43rd HAG | |
| 155th Siege Battery | 41st HAG | Moved to 36th HAG in January 1918 |
| 156th Siege Battery | 47th HAG | |
| 157th Siege Battery | 70th HAG | |
| 158th Siege Battery | 7th HAG | |
| 159th Siege Battery | Mesopotamia | |
| 160th Siege Battery | 5th HAG | |
| 161st Siege Battery | 51st HAG | |
| 162nd Siege Battery | 67th HAG | |
| 163rd Siege Battery | 81st HAG | |
| 164th Siege Battery | 52nd HAG | |
| 165th (Canadian) Siege Battery | Renamed 5th Canadian Siege Battery in 1917 | |
| 166th Siege Battery | 49th HAG | |
| 167th (Canadian) Siege Battery | Renamed 6th Canadian Siege Battery in 1917 | |
| 168th Siege Battery | 68th HAG | |
| 169th Siege Battery | 51st HAG | |
| 170th Siege Battery | 35th HAG | |
| 171st Siege Battery | 15th HAG | Italy. Some later changes. Refer to “Allocations” for details. |
| 172nd Siege Battery | 24th HAG | Italy |
| 173rd Siege Battery | 54th HAG | |
| 174th Siege Battery | 79th HAG | Some later changes. Refer to “Allocations” for details. |
| 175th Siege Battery | 56th HAG | |
| 176th Siege Battery | 80th HAG | Italy |
| 177th Siege Battery | 2nd HAG | |
| 178th Siege Battery | 89th HAG | |
| 179th Siege Battery | 81st HAG | |
| 180th Siege Battery | 18th HAG | |
| 181st Siege Battery | 80th HAG | Italy. Some later changes. Refer to “Allocations” for details. |
| 182nd Siege Battery | 22nd HAG | |
| 183rd Siege Battery | 60th HAG | |
| 184th Siege Battery | 81st HAG | |
| 185th Siege Battery | 79th HAG | Some later changes. Refer to “Allocations” for details. |
| 186th Siege Battery | 40th HAG | |
| 187th Siege Battery | 79th HAG | Some later changes. Refer to “Allocations” for details. |
| 188th Siege Battery | 53rd HAG | |
| 189th Siege Battery | 55th HAG | Left to become Army Troops January 1918 |
| 190th Siege Battery | 43rd HAG | |
| 191st Siege Battery | 77th HAG | |
| 192nd Siege Battery | 55th HAG | Left to become Army Troops January 1918 |
| 193rd Siege Battery | 7th HAG | |
| 194th Siege Battery | 87th HAG | |
| 195th Siege Battery | 29th HAG | |
| 196th Siege Battery | 85th HAG | Moved to 40th HAG February 1918 |
| 197th Siege Battery | 15th HAG | Italy |
| 198th Siege Battery | Not allotted to HAG and in GHQ Reserve until becoming Army Troops January 1918 | |
| 199th Siege Battery | 39th HAG | Moved to 54th HAG January 1918 |
| 200th Siege Battery | 5th HAG | |
| 201st Siege Battery | 97th HAG | Egypt and Palestine. Some later changes including a move to France May 1918. Refer to “Allocations” for details. |
| 202nd Siege Battery | 65th HAG | |
| 203rd Siege Battery | 86th HAG | |
| 204th Siege Battery | 16th HAG | |
| 205th Siege Battery | 61st HAG | Egypt and Palestine. Some later changes. Refer to “Allocations” for details. |
| 206th Siege Battery | 39th HAG | |
| 207th Siege Battery | 4th HAG | Moved to 54th HAG January 1918 |
| 208th Siege Battery | 45th HAG | |
| 209th Siege Battery | 100th HAG | Egypt and Palestine. Some later changes. Refer to “Allocations” for details. |
| 210th Siege Battery | 98th HAG | |
| 211th Siege Battery | 68th HAG | |
| 212th Siege Battery | 65th HAG | |
| 213th Siege Battery | 28th HAG | Moved to 49th HAG in August 1918 |
| 214th Siege Battery | 14th HAG | |
| 215th Siege Battery | 93rd HAG | |
| 216th Siege Battery | 27th HAG | |
| 217th Siege Battery | 70th HAG | |
| 218th Siege Battery | 18th HAG | |
| 219th Siege Battery | 87th HAG | |
| 220th Siege Battery | 56th HAG | |
| 221st Siege Battery | 33rd HAG | |
| 222nd Siege Battery | 79th HAG | Left to become Army Troops in January 1918 |
| 223rd Siege Battery | 62nd HAG | |
| 224th Siege Battery | 62nd HAG | |
| 225th Siege Battery | 89th HAG | |
| 226th Siege Battery | 10th HAG | |
| 227th Siege Battery | 6th HAG | |
| 228th Siege Battery | 76th HAG | |
| 229th Siege Battery | 24th HAG | Italy |
| 230th Siege Battery | 83rd HAG | |
| 231st Siege Battery | Not allotted to HAG until February 1918 when joining 93rd | |
| 232nd Siege Battery | 93rd HAG | |
| 233rd Siege Battery | 76th HAG | |
| 234th Siege Battery | 67th HAG | |
| 235th Siege Battery | 8th HAG | |
| 236th Siege Battery | 18th HAG | |
| 237th Siege Battery | 89th HAG | |
| 238th Siege Battery | 69th HAG | |
| 239th Siege Battery | 81st HAG | |
| 240th Siege Battery | 104th HAG | Italy |
| 241st Siege Battery | 30th HAG | |
| 242nd Siege Battery | 12th HAG | |
| 243rd Siege Battery | 8th HAG | Some later changes. Refer to “Allocations” for details. |
| 244th Siege Battery | 90th HAG | |
| 245th Siege Battery | 6th HAG | |
| 246th Siege Battery | Mesopotamia | |
| 247th Siege Battery | 24th HAG | Italy |
| 248th Siege Battery | 17th HAG | |
| 249th Siege Battery | 53rd HAG | |
| 250th Siege Battery | 2nd HAG | |
| 251st Siege Battery | 53rd HAG | |
| 252nd Siege Battery | 53rd HAG | |
| 253rd Siege Battery | 22nd HAG | |
| 254th Siege Battery | 1st HAG | |
| 255th Siege Battery | 51st HAG | |
| 256th Siege Battery | 23rd HAG | Moved to 40th HAG January 1918 |
| 257th Siege Battery | Mesopotamia | |
| 258th Siege Battery | 19th HAG | Moved to 88th HAG February 1918 |
| 259th Siege Battery | 52nd HAG | |
| 260th Siege Battery | At Fourth Army Artillery School, not allocated to HAG. Moved to 9th HAG January 1918 | |
| 261st Siege Battery | 4th HAG | |
| 262nd Siege Battery | 90th HAG | Moved to 54th HAG January 1918 |
| 263rd Siege Battery | 12th HAG | |
| 264th Siege Battery | 52nd HAG | |
| 265th Siege Battery | 22nd HAG | |
| 266th Siege Battery | 39th HAG | |
| 267th Siege Battery | 35th HAG | |
| 268th Siege Battery | 3rd HAG | |
| 269th Siege Battery | Mesopotamia | |
| 270th Siege Battery | 98th HAG | |
| 271st Siege Battery | ? | |
| 272nd Siege Battery | ? | |
| 273rd Siege Battery | ? | |
| 274th Siege Battery | 62nd HAG | |
| 275th Siege Battery | 50th HAG | |
| 276th Siege Battery | 84th HAG | |
| 277th Siege Battery | 90th HAG | |
| 278th Siege Battery | 34th HAG | |
| 279th Siege Battery | 33rd HAG | |
| 280th Siege Battery | 16th HAG | |
| 281st Siege Battery | 39th HAG | |
| 282nd Siege Battery | 99th HAG | |
| 283rd Siege Battery | 51st HAG | |
| 284th Siege Battery | 83rd HAG | |
| 285th Siege Battery | 99th HAG | |
| 286th Siege Battery | 77th HAG | |
| 287th Siege Battery | 22nd HAG | |
| 288th Siege Battery | Not allocated to HAG in late December 1917. Some later changes. Refer to “Allocations” for details. | |
| 289th Siege Battery | 80th HAG | Italy. Some later changes. Refer to “Allocations” for details. |
| 290th Siege Battery | 8th HAG | |
| 291st Siege Battery | 69th HAG | |
| 292nd Siege Battery | 97th HAG | Egypt and Palestine. Some later changes including move to France May 1918. Refer to “Allocations” for details. |
| 293rd Siege Battery | 104th HAG | Italy, Moved to 94th HAG January 1918 |
| 294th Siege Battery | 98th HAG | |
| 295th Siege Battery | 5th HAG | |
| 296th Siege Battery | 14th HAG | |
| 297th Siege Battery | 19th HAG | |
| 298th Siege Battery | 33rd HAG | |
| 299th Siege Battery | 90th HAG | |
| 300th Siege Battery | 96th HAG | |
| 301st Siege Battery | 4th HAG | |
| 302nd Siege Battery | 15th HAG | |
| 303rd Siege Battery | 29th HAG | |
| 304th Siege Battery | 95th HAG | Egypt and Palestine |
| 305th Siege Battery | 60th HAG | |
| 306th Siege Battery | 66th HAG | |
| 307th Siege Battery | 15th HAG | Italy |
| 308th Siege Battery | 30th HAG | |
| 309th Siege Battery (Honourable Artillery Company) | 47th HAG | |
| 310th to 313th Siege Batteries | Batteries no longer existed | |
| 314th Siege Battery | 95th HAG | Egypt and Palestine |
| 315th Siege Battery | 94th HAG | Italy |
| 316th Siege Battery | 94th HAG | Italy |
| 317th Siege Battery | 94th HAG | Italy |
| 318th Siege Battery | Battery no longer existed | |
| 319th Siege Battery | 12th HAG | |
| 320th Siege Battery | 95th HAG | Egypt and Palestine but left for Salonika with 61st HAG in April 1918. Refer to “Allocations” for details. |
| 321st Siege Battery | 19th HAG | |
| 322nd Siege Battery | 95th HAG | Egypt and Palestine but left for Salonika with 61st HAG in April 1918. Refer to “Allocations” for details. |
| 323rd Siege Battery | 42nd HAG | Attached to 78th HAG 24.10.1918 to 8.11.1918. |
| 324th Siege Battery | 86th HAG | |
| 325th Siege Battery | 66th HAG | |
| 326th Siege Battery | 91st HAG | |
| 327th Siege Battery | 23rd HAG | |
| 328th Siege Battery | 88th HAG | |
| 329th Siege Battery | 28th HAG | |
| 330th Siege Battery | 73rd HAG | Later to 11th HAG and then became Army Troops. Refer to “Allocations” for details. |
| 331st Siege Battery | 69th HAG | |
| 332nd Siege Battery | 71st HAG | |
| 333rd Siege Battery | Railway Guns. Numerous changes. Refer to “Allocations” for details. | |
| 334th Siege Battery | 95th HAG | Egypt and Palestine. Left Feb 1918. Numerous changes thereafter. Refer to “Allocations” for details. |
| 335th Siege Battery | 59th HAG | |
| 336th Siege Battery | 84th HAG | |
| 337th Siege Battery | 91st HAG | |
| 338th to 341st Siege Batteries | Batteries no longer existed | |
| 342nd Siege Battery | 60th HAG | |
| 343rd Siege Battery | Railway Guns. Numerous changes. Refer to “Allocations” for details. | |
| 344th and 345th Siege Batteries | Batteries no longer existed | |
| 346th Siege Battery | 49th HAG | |
| 347th and 348th Siege Batteries | Batteries no longer existed | |
| 349th Siege Battery | Not allotted to a HAG | |
| 350th Siege Battery | 59th HAG | |
| 351st Siege Battery | 43rd HAG | |
| 352nd Siege Battery | 2nd HAG | |
| 353rd Siege Battery | 36th HAG | |
| 354th Siege Battery | 21st HAG | |
| 355th Siege Battery | 23rd HAG | |
| 356th to 358th Siege Batteries | Batteries no longer existed | |
| 359th Siege Battery | 11th HAG | Railway Guns. Left to become Army Troops January 1918. |
| 360th to 362nd Siege Batteries | Batteries no longer existed | |
| 363rd Siege Battery | 25th HAG | Railway Guns. Left to join 11th HAG January 1918 and became Army Troops in March 1918. |
| 364th Siege Battery | Battery no longer existed | |
| 365th Siege Battery | Battery no longer existed | |
| 366th Siege Battery | Railway Guns. Not allotted to a HAG | |
| 367th to 373rd Siege Batteries | Batteries no longer existed | |
| 374th Siege Battery | 5th HAG | Became Army Troops in Feb 1918 |
| 375th Siege Battery | 59th HAG | To 72nd HAG in Jan 1918 and became Army Troops in April 1918 |
| 376th and 377th Siege Batteries | Batteries no longer existed | |
| 378th Siege Battery | 96th HAG | Egypt and Palestine |
| 379th Siege Battery | 97th HAG | Egypt and Palestine. Frequent changes thereafter including move to France May 1918. Refer to “Allocations” for details. |
| 380th Siege Battery | 102nd HAG | Egypt and Palestine |
| 381st Siege Battery | 73rd HAG | Railway Guns. Left to join 11th HAG February 1918 and became Army Troops in March 1918. |
| 382nd Siege Battery | Battery no longer existed | |
| 383rd Siege Battery | 96th HAG | Egypt and Palestine |
| 384th Siege Battery | 38th HAG | Mesopotamia |
| 385th Siege Battery | Battery no longer existed | |
| 386th Siege Battery | Battery no longer existed | |
| 387th Siege Battery | 38th HAG | Mesopotamia, Later to Egypt. Refer to “Allocations” for details. |
| 388th Siege Battery | Battery no longer existed | |
| 389th Siege Battery | Battery no longer existed | |
| 390th Siege Battery | 103rd HG | Egypt and Palestine. Moved to Italy and 104th HAG Jan 1918. |
| 391st Siege Battery | 103rd HAG | Egypt and Palestine. Moved to Italy and 104th HAG Jan 1918. |
| 392nd Siege Battery | Mesopotamia. I Indian Corps B Group. | |
| 393rd Siege Battery | 11th HAG | Left to become Army Troops January 1918 |
| 394th Siege Battery | Mesopotamia. Moved to Egypt May 1918 | |
| 395th Siege Battery | 101st HAG | Mesopotamia |
| 396th Siege Battery | 101st HAG | Mesopotamia. Frequent changes thereafter including move to Egypt and then Salonika May and July 1918. Refer to “Allocations” for details. |
| 397th to 404th Siege Batteries | Batteries no longer existed | |
| 405th Siege Battery | 99th HAG | |
| 406th to 408th Siege Batteries | Batteries no longer existed | |
| 409th Siege Battery | 25th HAG | Left to become Army Troops February 1918 |
| 410th to 419th Siege Batteries | Batteries no longer existed | |
| 420th Siege Battery | 97th HAG | Egypt and Palestine. Moved to France May 1918 |
| 421st Siege Battery | 97th HAG | Egypt and Palestine |
| 422nd Siege Battery | 97th HAG | Egypt and Palestine |
| 423rd Siege Battery | 97th HAG | Egypt and Palestine. Moved to France May 1918 |
| 424th Siege Battery | En route between Egypt and Salonika in late December 1917, Refer to “Allocations” for details thereafter. | |
| 425th to 430th Siege Batteries | Batteries no longer existed | |
| 431st Siege Battery | 34th HAG | Moved to become Army Troops January 1918 |
| 432nd and 433rd Siege Batteries | Batteries no longer existed | |
| 434th Siege Battery | 25th HAG | Moved to become Army Troops April 1918 |
| 435th to 437th Siege Batteries | Batteries no longer existed | |
| 438th Siege Battery | At home. Went overseas early 1918 | |
| 439th Siege Battery | Battery no longer existed | |
| 440th Siege Battery | 96th HAG | Egypt and Palestine |
| 441st Siege Battery | Battery no longer existed | |
| 442nd Siege Battery | 58th HAG | 2 Railway Guns. Left to become Army Troops February 1918 |
| 443rd Siege Battery | 103rd HAG | Egypt and Palestine. Some later changes including move to France May 1918. Refer to “Allocations” for details. |
| 444th Siege Battery | 26th HAG | 2 Railway Guns. Left to become Army Troops March 1918 |
| 445th Siege Battery | Egypt and Palestine. Not allocated to HAG in late December 1917. Some later changes including move to Salonika May 1918. Refer to “Allocations” for details. | |
| 446th Siege Battery | Battery no longer existed | |
| 447th Siege Battery | At home, about to go to France. Refer to “Allocations” for details. | |
| 448th Siege Battery | Battery no longer existed | |
| 449th Siege Battery | Temporarily broken up in late December 1917 but reformed later. Refer to “Allocations” for details. | |
| 450th Siege Battery | 67th HAG | Left to become Army Troops January 1918 |
| 451st to 454th Siege Batteries | At home, about to go to France. Refer to “Allocations” for details. | |
| 455th Siege Battery | ? | |
| 456th Siege Battery | 26th HAG | Left to become Army Troops February 1918 |
| 457th to 460th Siege Batteries | ? | |
| 461st Siege Battery | 26th HAG | 2 Railway Guns. Some later changes. Refer to “Allocations” for details. |
| 462nd to 470th Siege Batteries | ? | |
| 471st Siege Battery | 2 Railway Guns. At home, about to go to France. Refer to “Allocations” for details. | |
| 472nd to 478th Siege Batteries | ? | |
| 479th Siege Battery | 1st HAG | Some later changes. Refer to “Allocations” for details. |
| 480th Siege Battery | ? | |
| 481st Siege Battery | Just arrived in France. Not yet allocated. Some later changes. Refer to “Allocations” for details. | |
| 482nd and 483rd Siege Batteries | ? | |
| 484th Siege Battery | Just arrived in France. Not yet allocated. Some later changes. Refer to “Allocations” for details. | |
| 485th to 546th Siege Batteries | None arrived overseas by late December 1917. Refer to “Allocations” for details. |