On 11 September 1939, all the available heavy AA (HAA) guns in 46 AA Bde (76th AA Rgt's eight guns) were concentrated to cover Avonmouth Docks. These guns were relocated to Filton Aerodrome in October. In the near-total absence of light AA (LAA) guns, detachments from other units armed with Light machine guns were deployed during October to cover Vulnerable Points (VPs) such as airfields and aircraft factories. 76th AA Regiment manned 16 Lewis guns at Parnall Aircraft, Yate, until they were relieved by 68th (Monmouthshire Regiment) Searchlight Rgt in November.
