89 Anti-Aircraft Regiment RA(TA) was raised at Chatham in April 1939. It was re-designated as 89 Heavy Anti-Aircraft Regiment RA(TA) in June 1940. The Regiment was placed in suspended animation in September 1944 and reconstituted as 489 (Cinque Ports) Heavy Anti-Aircraft Regiment RA(TA) in January 1947.
| Apr 39 | 28 Anti-Aircraft Brigade, 6 Anti-Aircraft Division | Chatham, Kent, UK |
| Sep 40 | War Office Reserve | UK |
| Feb 41 | British Troops Egypt | Suez, Egypt |
| Apr 41 | 234 Battery to Crete, 235 Battery to Tobruk | |
| Apr 41 | 2 Anti-Aircraft Brigade – RHQ & 205 Battery | Suez, Egypt |
| Jan 43 | 1 Anti-Aircraft Brigade | Benghazi, Libya |
| Feb 43 | Diluted with men of the African Pioneer Corps | |
| Sep 43 | 8 Army | Alexandria, Egypt |
| Sep 43 | 8 Anti-Aircraft Brigade | Brindisi, Italy |
| Jul 44 | 25 Anti-Aircraft Brigade | Brindisi, Italy |
| Aug 44 | Suspended animation |
Batteries
| Apr 39 | 205 (Kent), 234 (Kent), 235 (Kent), 306 |
| May 40 | 205, 234, 235 |
| Apr 41 | 234 detached to Crete, 235 detached to Tobruk |
| Jul 41 | 234 disbanded due to losses on Crete |
| Dec 41 | 205, 231 |
| Apr 42 | 205, 231, 235 |
