100 Anti-Aircraft Brigade was formed in April 1943 at Cliftonville, Kent. In May it moved to Blandford in Dorset. By November it was at Northampton. In June 1944 it was under 21 Army Group, part of GHQ AA Troops England. By September it was with 2 Army, supporting 30 Corps between Arras & Antwerp. In October it had advaced to Nijmegen and consequently took over defence of the Mook & Grave bridges. By December it was at Weert, Deurne & Helmond. It took part in Operation Veritable (Reichswald) supporting 8 Corps. In March 1945 they were at Xanten under 12 Corps protecting the bridge. 100 Anti-Aircraft Brigade was disbanded in February 1946.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Apr 43 | Formed, Kent | | Home Forces |
| May 43 | Blandford, Dorset | | Home Forces |
| Nov 43 | Northampton | | Home Forces |
| Jun 44 | GHQ AA Troops England |  | 21 Army Group |
| Sep 44 | Normandy, 30 Corps |  | 2 Army |
| Oct 44 | Belgium, 30 Corps | | 2 Army |
| Dec 44 | Weert, Holland | | 2 Army |
| Feb 45 | Op Veritable, Reichswald, Germany |  | 8 Corps |
| Mar 45 | Xanten, Germany |  | 12 Corps |
| Feb 46 | Disbanded | | |
Order of Battle June 1944
| 90 Heavy Anti-Aircraft Regiment (272, 284, 285 Batteries) |
| 107 Heavy Anti-Aircraft Regiment (334, 335, 337 Batteries) |
| 123 Light Anti-Aircraft Regiment less 2 batteries |
Order of Battle August 1944
| 60 Heavy Anti-Aircraft Regiment (168, 169, 206 Batteries) |
| 107 Heavy Anti-Aircraft Regiment |
| 71 Light Anti-Aircraft Regiment (210, 211, 262 Batteries) |
| 113 Light Anti-Aircraft Regiment (368, 369, 370 Batteries) |
| 123 Light Anti-Aircraft Regiment (405, 408, 409 Batteries) |
| 557 Searchlight Battery |
Order of Battle 4th September 1944
| 90 Heavy Anti-Aircraft Regiment |
| 107 Heavy Anti-Aircraft Regiment |
| 71 Light Anti-Aircraft Regiment |
| One Troop, 344 Searchlight Battery |
Order of Battle 27th September 1944
Nijmegen
| 107 Heavy Anti-Aircraft Regiment |
| 165 Heavy Anti-Aircraft Regiment (198, 275, 317 Batteries) |
| 113 Light Anti-Aircraft Regiment |
| 123 Light Anti-Aircraft Regiment |
| 2 Light Anti-Aircraft/Searchlight Battery |
| One Troop, 474 Searchlight Battery |
| One Troop, 557 Searchlight Battery |
Order of Battle October/November 1944
Nijmegen
| 107 Heavy Anti-Aircraft Regiment |
| 90 Heavy Anti-Aircraft Regiment |
| 113 Light Anti-Aircraft Regiment |
| 123 Light Anti-Aircraft Regiment |
| 321 Battery, 93 Light Anti-Aircraft Regiment |
| 2 Light Anti-Aircraft/Searchlight Battery |
| One Troop, 474 Searchlight Battery |
| One Troop, 557 Searchlight Battery |
Order of Battle December 1944
| 90 Heavy Anti-Aircraft Regiment |
| 107 Heavy Anti-Aircraft Regiment |
| 113 Light Anti-Aircraft Regiment |
| 123 Light Anti-Aircraft Regiment |
| Two Troops, 474 Searchlight Battery |
Order of Battle February 1945
Operation Veritable
| 90 Heavy Anti-Aircraft Regiment |
| 99 Heavy Anti-Aircraft Regiment (302, 303, 318 Batteries) |
| 113 Light Anti-Aircraft Regiment |
| 121 Light Anti-Aircraft Regiment (396, 397, 399 Batteries) |
| 123 Light Anti-Aircraft Regiment |
| 2 Light Anti-Aircraft/Searchlight Battery |
| 474 Searchlight Battery |
| Under command 58, 92, 108 Divisional Light Anti-Aircraft Regiments |
Order of Battle March 1945
| 90 Heavy Anti-Aircraft Regiment |
| 108 Heavy Anti-Aircraft Regiment (338, 382, 421 Batteries) |
| 112 Light Anti-Aircraft Regiment less one battery |
| 113 Light Anti-Aircraft Regiment |
| 123 Light Anti-Aircraft Regiment |
| 322 Battery, 93 Light Anti-Aircraft Regiment |
| 2 Light Anti-Aircraft/Searchlight Battery |
| 474 Searchlight Battery |
Order of Battle April 1945
| 165 Heavy Anti-Aircraft Regiment (198, 275, 317 Batteries) |
| 113 Light Anti-Aircraft Regiment |
| 109 Light Anti-Aircraft Regiment |
| 2 Light Anti-Aircraft/Searchlight Battery |
| 5 Battery, 2 Searchlight Regiment |
| 474 Searchlight Battery |
