HMNB Portsmouth the military and naval units destined for Sword Beach on the Normandy coast as a part of Operation Overlord and the D-Day landings on 6 June 1944. Troops destined for each of the landing beaches left from Portsmouth aboard vessels such as the armed merchant cruisers HMCS "Prince Henry" and HMCS "Prince David", escorted by the Canadian destroyers HMCS "Algonquin" and "Sioux". The majority of the naval support for the operation left from Portsmouth, including the Mulberry Harbours. Boathouse 4 (built around the start of hostilities) contributed to the construction of landing craft and support vessels as well as more
Australian contribution to the Battle of Normandy successful, and earned Hudspeth his second Distinguished Service Cross (DSC). Nancy Wake, an Australian serving with the British Special Operations Executive, was parachuted into France in April 1944 and subsequently helped to organise the French Resistance in the Auvergne region. On the night of 5/6 June Bomber Command conducted precision attacks on ten German coastal artillery batteries near the beaches where Allied troops were to land. Each battery was targeted by approximately 100 heavy bombers, and all four Australian heavy bomber squadrons took part in the operation. No. 460 Squadron dispatched 26 aircraft, which were evenly split between attacking the