With increasing evidence that the Japanese were massing forces to strike at British Malaya, the Singapore garrison was brought to the second degree of readiness on 1 December 1941. The Japanese invasion of Malaya began with seaborne landings just after midnight on the night of 7/8 December (before the Attack on Pearl Harbor). The first air raid on Singapore came in at 03.30 that same night, though the night fighters were not scrambled because the defences had not practised sufficiently to coordinate them with the AA guns and S/Ls. The AA guns failed to destroy any enemy aircraft.