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
Provisional Government of the French Republic on 3 June 1944, the day before Charles de Gaulle arrived in London from Algiers on Winston Churchill's invitation, and three days before D-Day. The CFLN itself had been created exactly one year earlier through the uniting of de Gaulle's ("Comité national français", or CNF) and Henri Giraud's organisations. Among its most immediate concerns were to ensure that France did not come under allied military administration, preserving the sovereignty of France and freeing allied troops for fighting on the front. After the liberation of Paris on 25 August 1944, it moved back to the capital, establishing a new "national unanimity"