 Here the battery underwent training and began to receive the powerful new 150 cm searchlight to supplement the standard 90 cm equipment.From the beginning of June there were almost nightly alerts as the Battle of Britain got under way, and on the night of 18/19 June several "Luftwaffe" bombers were picked up by searchlights of 63rd Rgt and destroyed by AA guns and night fighters.On 3 July 1940 the battery was transferred from 63rd S/L Rgt to 3rd (Ulster) S/L Rgt, just returned from the Dunkirk evacuation, but three weeks later it was ordered to hand over its sites to another battery of 3rd S/L Rgt and move to Cornwall where it joined the newly formed 76th S/L Rgt under 55th AA Bde.