Royal Fusiliers cap badge; the AA companies were redesignated S/L batteries. By this stage, the regiment had been transferred within 2nd AA Division to 41st (London) AA Bde covering East Anglia. It remained with this formation throughout the Battle of Britain and The Blitz. The regiment supplied a cadre of experienced officers and men to 233rd S/L Training Rgt at Saighton Camp where it provided the basis for a new 527 S/L Bty formed on 14 November 1940. This battery later joined 86th S/L Rgt. Mid-War On 15 July 1941 the regiment was joined by 561 S/L Bty; this battery had been formed on 17 April by a cadre from 63rd (Queen's) S/L Rgt at 230th S/L Training Rgt, Blandford Camp. Otherwise the regiment's organisation and subordination remained unchanged until 20 December 1942, when 354 S/L Bty, a mobile S/L unit stationed at Peterborough, was re-regimented from 39th (Lancashire Fusiliers) S/L Rgt to 69th (3rd Londons) and moved to Old Buckenham in Norfolk. (354 S/L Bty continued to wear its Lancashire Fusiliers regimental badges and buttons.) 39th S/L Regiment was being disbanded and its former CO, Lt-Col R.R. Rainsford, TD, took over as CO of the 69th on 5 July 1943. In the summer of 1943, the regiment moved to the West Country, joining 64th Anti-Aircraft Brigade in 3 AA Group (a new system of AA Groups had replaced the AA Divisions the previous year). 354 S/L Battery moved to Kintbury in Berkshire in May 1943. By this stage of the warAA Command was suffering a manpower crisis: it was required to release units and personnel to the field armies and was still short of Light AA (LAA) gun units, but it was over-provided with S/L units. The solution was to convert existing S/L units or to disband them and redistribute the personnel. Having been one of the last S/L batteries to be formed, 561 S/L Bty was chosen to be converted into 507 (Independent) LAA Bty on 3 June 1943. By early 1944, AA Command was forced to release further manpower for Operation Overlord (the Allied invasion of Normandy) and most S/L regiments lost one of their four batteries: 458 S/L Bty and the E Troops of 354 and 456 S/L Btys from 69th (3rd London) S/L Rgt all began disbanding 25 February, and the process was complete by 24 March. The regiment remained in the West Country, 354