On 5 June 1940, after the British Army had been evacuated from Dunkirk and the Battle of Britain was about to start, the 1st AA Division comprised 45 4.5-inch, 39 3.7-inch and 26 3-inch HAA guns, with three 3-inch, 19 Bofors, three twin Vickers and 185 LMGs in the LAA role, together with 240 90 cm searchlights. On 11 July, the division's guns were disposed with 92 defending London, 28 at Slough, 4 at Hounslow, 4 at Stanmore, and 34 others dispersed to VPs.