On 21 March 1943 No. 341 Squadron RAF, also known as the Groupe de Chasse n° 3/2 “Alsace” arrived at Biggin Hill, one of the front line fighter stations in the south east of England. It was composed of members of the Free French forces fighting alongside the Allies, under Squadron Leader Mouchotte. They were now equipped with Supermarine Spitfire L.F Mk.IXs, one of the most refined versions of the fighter aircraft. From here they mounted sweep patrols over the English Channel, probing the German defences of occupied Europe.