President Roosevelt lectures Americans on their conduct. Churchill visits the U.S. American troops are deployed in England, and Eisenhower gets command of the European Theater of Operations.

Eisenhower inspects the landing beaches and we see the "Mulberry" harbors put in place along the Normandy beaches. Airfields are built and supplies offloaded. V-1 rockets attack London. We see Germans build the V-2 rockets. Storms wreck a Mulberry harbor and damage the other. Cherbourg is taken, but is wrecked by the Germans. The British and Canadians work to take Caen. Operation Cobra is launched to break out of Normandy.

This installment talks about the lesson learned, military and diplomatic, about coalition warfare. It includes a reenactment of the Alamogordo atomic bomb test, as well as its use against Japan.