The manpower requirements for the forthcoming Allied invasion of Normandy (Operation Overlord) led to further reductions in coast defences in April 1944. By this stage of the war many of the coast battery positions were manned by Home Guard detachments or in the hands of care and maintenance parties. On 1 April 168 and 286 Btys were transferred from 517th to 516th Coast Rgt, and 220 Bty was transferred in the opposite direction, while No 3 COD was disbanded.