Throughout the second half of the 1930s there was a need to increase the anti-aircraft defences of the United Kingdom, particularly so for London and Southern England. As a result, in 1935, the 4th City of London Regiment (The Royal Fusiliers) was converted into an artillery role, transferring to the Royal Artillery and converted into 60th (City of London) Anti-Aircraft Brigade, Royal Artillery and becoming part of 27th (Home Counties) Anti-Aircraft Group, 1st Anti-Aircraft Division (formed by conversion of the Headquarters of 47th (2nd London) Infantry Division). They were replaced in the brigade by the 10th London Regiment (Hackney) from the 169th (3rd London) Infantry Brigade. The battalion was previously known as the 10th (County of London) Battalion, London Regiment (Hackney). After the 47th Division was disbanded the 56th Division was redesignated as the London Division and the brigade became 1st London Infantry Brigade.