The fourth of Frank Capra's Why We Fight series of seven propaganda films, which made the case for fighting and winning the Second World War. It was released in 1943 and concentrated on the German bombardment of the United Kingdom in anticipation of Operation Sea Lion, the planned German invasion.

• War Activities Committee of the Motion Pictures Industry
• U.S. War Department
• Walter Huston
• Frieda Inescort
• John B. Hughes