The raising of 16 new Siege Batteries of the Royal Garrison Artillery was authorised by Army Council Instruction 1544/1916, with effect from 31 July 1916.
| RGA Siege Battery | Raised at |
|---|---|
| 206 | Aldershot |
| 207 | Aldershot |
| 208 | Dover |
| 209 | Portland |
| 210 | Forth |
| 211 | Falmouth |
| 212 | Fareham |
| 213 | Sheerness |
| 214 | Portsmouth |
| 215 | Portsmouth |
| 216 | Portland |
| 217 | Tynemouth |
| 218 | Plymouth |
| 219 | Pembroke Dock |
| 220 | Harwich |
| 221 | Clyde |
Number 220 Siege Battery RGA was to be raised from the Essex and Suffolk Artillery