Formed in July 1943 as RHQ 1 Anti-Aircraft Fort RA at Militia Camp, Rainham, Chatham. Two weeks later it amalgamated with 637 Independent Heavy Anti-Aircraft Battery RA to form 1 Anti-Aircraft Fort Regiment RA. The Regiment was disbanded in November 1945.
| Jul 43 | Formed as RHQ 1 Anti-Aircraft Fort RA to command Maunsell Fort batteries in Thames Estuary |
Chatham, Kent, UK |
| Jul 43 | Amalgamated with 637 Battery to form 1 Anti-Aircraft Fort Regiment RA |
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| Nov 45 | Disbanded |