These units were formed as part of the raising of the Third New Army, K3. They are also sometimes shown as 102, 103, 104 and 105 (Howitzer) Brigades RFA.
CII
- This brigade was originally comprised of A, B, C and D Batteries RFA and the Brigade Ammunition Column. It was placed under command of the 23rd Division. The batteries were all armed with four 18-pounder field guns. The brigade then remained with the division throughout the war: you can see details of its battles and movements on the page describing the division.
- Between 15 and 19 May the Brigade Ammunition Column left, being merged into the 23rd Divisional Ammunition Column.
- On 19 May 1916 D Battery left to join 10 5 Brigade, becoming its A Battery. A (Howitzer) Battery joined from 105 Brigade and was became 102 Brigade’s D (Howitzer) Battery.
- On 3 September 1916 the field gun batteries were made up to six guns. A section of two from A Battery of 105 Brigade arrived and joined A Battery, and the other section joined B Battery. A section joined C Battery from C Battery of 105 Brigade.
- The howitzer battery was also made up to six on 18 January 1917 by the arrival of a section of two from C (Howitzer) Battery of 104 Brigade.
CIII
- This brigade was originally comprised of A, B, C and D Batteries RFA and the Brigade Ammunition Column. It was placed under command of the 23rd Division. The batteries were all armed with four 18-pounder field guns. The brigade then remained with the division throughout the war: you can see details of its battles and movements on the page describing the division.
- Between 15 and 19 May the Brigade Ammunition Column left, being merged into the 23rd Divisional Ammunition Column.
- On 20 May 1916 D Battery left to join 105 Brigade, becoming its B Battery. B (Howitzer) Battery joined from 105 Brigade and became 103 Brigade’s D (Howitzer) Battery.
- On 1-3 September 1916 the field gun batteries were made up to six guns. A section of two from B Battery of 105 Brigade arrived and joined B Battery, and the other section joined C Battery. A section joined A Battery from C Battery of 105 Brigade.
- The howitzer battery was also made up to six on 18 January 1917 by the arrival of a section of two from C (Howitzer) Battery of 104 Brigade.
CIV
- This brigade was originally comprised of A, B, C and D Batteries RFA and the Brigade Ammunition Column. It was placed under command of the 23rd Division. The batteries were all armed with four 18-pounder field guns. The brigade then remained with the division until early 1917: you can see details of its battles and movements on the page describing the division.
- Between 15 and 19 May the Brigade Ammunition Column left, being merged into the 23rd Divisional Ammunition Column.
- On 19 May 1916 D Battery left to join 105 Brigade, becoming its C Battery. C (Howitzer) Battery joined from 105 Brigade and became 104 Brigade’s D (Howitzer) Battery.
- On 3 September 1916 the field gun batteries were made up to six guns. C Battery was broken up and its sections of two guns joined A and B batteries respectively. D (Howitzer) Battery joined from 105 Brigade and became C (Howitzer) Battery.
- On 18 January 1917 C (Howitzer) Battery was broken up, with its sections of two howitzers going to the D (Howitzer) Batteries of 102 and 103 Brigades respectively.
- On the same date, 104 Brigade left 23rd Division t become an Army Field Artillery Brigade.
- B Battery joined from 238 Brigade (of 47th (London) Division) on 21 January 1917 and became 104 Brigade’s new C Battery.
CV (Howitzer)
- This brigade was originally comprised of A, B, C and D (Howitzer) Batteries RFA and the Brigade Ammunition Column. It was placed under command of the 23rd Division. The batteries were all armed with four 4.5-inch howitzers. The brigade then remained with the division until it was broken up in September 1916: you can see details of its battles and movements on the page describing the division.
- Between 15 and 19 May the Brigade Ammunition Column left, being merged into the 23rd Divisional Ammunition Column.
- On 19-20 May 1916 A, B and C (Howitzer) Batteries all left, becoming the D (Howitzer) Batteries of 102, 103 and 104 Brigades respectively. The D (field gun) Batteries of those brigades joined 105 Brigade and were renamed as A, B and C Batteries.
- On 1-3 September 1916 the Brigade was broken up. A and one section of C Battery went to 102 Brigade; B and the other section of C went to 103 Brigade; and D (Howitzer) Battery went to 104 Brigade, becoming its C (Howitzer) Battery.