This episode (Sept 11–15, 1939) covers pivotal early WWII events: Warsaw's destruction, Allied attempts at coordination, critical codebreaking by Germany, near-disaster for the Ark Royal, and the first U-boat sunk. In America, Lindbergh promotes isolationism. The Soviet-Japanese war ends, freeing Stalin for action in Poland. Meanwhile, around the world, Ferrari is founded, and Sikorsky's helicopter takes flight as Europe edges toward greater catastrophe.