Key
| Heavy Anti-Aircraft Site |  |
Factory |  |
| Site No. | Site Name | OS Grid Reference |
| G1 | Shirenewton | ST 461 938 |
| G2 | Mounmon | ST 504 932 |
| G3 | Portskewet | ST 514 895 |
| G4 | Caldicot | ST 480 873 |
| G5 | St Brides | ST 435 892 |
| G6 | Llanvaches | ST 437 916 |
Gun Strengths
Battle of Britain & the Blitz
| Dates | 3 inch |
| Feb 41 | 4 |
| Mar 41 | 4 |
| Apr 41 | 4 |
| May 41 | 4 |
Overlord & Diver
| Dates | 3.7 inch mobile | 3.7 inch static |
| Mar 44 | 4 | 8 |
| Apr-Jul 44 | 8 |