It's March 1940 and the squadron loses another pilot, Treveylian, who has just arrived. Hart challenges Rex's tactics of flying tight formations and feels its what brought Treveylian down. Flash and Nicole decide to get married and Fitz asks Mary to marry him and they have a double wedding. The reception is interrupted when the château is bombed. The Nazi invasion of France has started in earnest and Rex is wounded. Despite being on pain killers, Rex insists on leading his men on patrol, with deadly results. Mary and Nicole are on their way to the British Embassy in Paris as a first step in relocating to England. They are strafed by a German fighter.