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
D-Day the Sixth of June at the Long Beach Naval Shipyard whilst the beach landing was made at Point Dume California. Before the days of computer-generated imagery director Henry Koster had to make his landing look convincing on his limited budget with two LCVPs and eighty soldiers. In the invasion scene soldiers running out of the two landing craft appear in front of a back projection scene of another take of the same scene giving the appearance of twice as many landing craft and soldiers as there actually were. Unlike many American war films "D-Day the Sixth of June" presents the viewpoints of British characters