Empire ship the Normandy invasion depended on the successful construction of the Mulberry ports. These were prefabricated ports, constructed at Southampton, Gosport, Portsmouth, Tilbury Docks, and even as far north as Birkenhead and Hartlepool. Two hundred tugs then took three months to tow the components of the harbours from where they were constructed to assembly areas on the South Coast. Between 7 June 1944 and the end of July, the tugs towed the materials across the channel to Normandy. Before D-Day, sixty old merchant ships and four old warships were selected as blockships, to be scuttled in a line to give protection
390th Strategic Missile Wing On 25 May 1944, a detachment of the group was directed to bomb coastal defenses in France using radar, despite weather conditions that were ideal for visual bombing. Although crewmembers were not advised why radar bombing was directed, this mission was a test to determine if pathfinder operations would succeed if the weather over Normandy was foul when the invasion took place. Thereafter, the group would frequently use pathfinder techniques when clouds obscured its assigned targets. The group bombed the coast near Caen fifteen minutes before the D-Day landings in Normandy on 6 June 1944. It attacked enemy artillery in