In 1938, after most of its battalions were posted away or converted to other units, the London Regiment ceased to exist and was disbanded. As a result, the 1st, 2nd and 3rd battalions became the 8th, 9th and 10th battalions, respectively, of the Royal Fusiliers and the 10th London Regiment (Hackney) became the 5th (Hackney) Battalion, Royal Berkshire Regiment. In the same year the 10th (3rd City of London) Battalion, Royal Fusiliers (City of London Regiment) was transferred to the Royal Artillery, becoming 10th (3rd City of London) Battalion, Royal Fusiliers (69th Searchlight Regiment) but remained part of the Royal Fusiliers until 1940. In 1938 when all British infantry brigades were reduced to three battalions, in August, the 5th (Hackney) Battalion, Royal Berkshire Regiment was transferred to 161st (Essex) Infantry Brigade of the 54th (East Anglian) Infantry Division and were replaced in the brigade by the London Irish Rifles (Royal Ulster Rifles) from 3rd London Infantry Brigade, previously the 18th London Regiment (London Irish Rifles) and, in 1908, the 18th (County of London) Battalion, London Regiment (London Irish Rifles). Again in 1938 the division was converted and reorganised as a motorised infantry division.