The great moment has come for these men two days before D-Day, when a destroyer gunnery officer briefed his gun director crews and main battery gunners. In a sealed ship the secret was unfolded, along with exhaustive maps, drawings and photographs of bombardment targets. The men had to know their objectives well, for there would be no time for error when they came into point blank range off the Normandy coast in the gathering light of D-Day’s early morning.