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
British Army during the Second World War (Gerard Bucknall, later Brian Horrocks) took part in the D-Day landings on 6 June 1944 at Sword Beach and Gold Beach, during Operation Overlord. VIII Corps (Richard O'Connor, later Evelyn Barker) entered the line during mid-June to add its weight to the assault, followed by XII Corps (Neil Ritchie) and II Canadian Corps On 23 July 1944 I Corps was transferred to the newly activated Canadian First Army, where it would remain until March 1945, followed by the II Canadian Corps at noon on 31 July. The Eighth Army was formed from the Western Desert Force in September 1941, under