Diplomatic history of World War II in the Dunkirk evacuation in late May/early June 1940. Tens of thousands of tanks, trucks and artillery guns were left behind, as well as all of the radios, machine guns, rifles, tents, spare parts and other gear. The new Prime Minister Winston Churchill pledged that Britain would continue to fight for France's freedom, even if it must do so alone. After Mers el Kebir, Britain recognised Free France as its ally and the legitimate government of France. The United States maintained diplomatic relations with Vichy (until late 1942) and avoided recognition of de Gaulle's claim to be the one and
Free Belgian forces (older) officers to other ranks. Since the Belgian military had officially surrendered in May 1940 and the Belgian Constitution specifically forbade Belgians from joining foreign militaries, the Free Belgian forces were officially committing treason; the charge was only annulled in 1948 and nobody was prosecuted. Despite the formation of all-Belgian ground units from late 1940, many Belgian volunteers – especially those in the Royal Air Force – served in majority British units, particularly in the early years after the formation of the Free Belgian forces. In 1940, the Belgian government-in-exile decided to raise a military unit from pre-war Belgian émigrés