WWII, episode 5: The Battle of Britain

Following the miraculous British evacuation from Dunkirk, the UK stood alone as the sole major, unconquered nation standing in the way of Adolf Hitler. The United States, officially neutral, tried to help out, using a cash-&-carry policy to supply the Brits, then a destroyers-for-bases plan designed to arm the British Navy while remaining neutral, then finally stretching the definition of "neutral" to its breaking point with the Lend-Lease policy. Meanwhile, the Royal Air Force and the Luftwaffe engaged in an all-out air war for the future of the UK. ... This episode also discusses, briefly, the North African front and the lead-up to Operation Barbarossa, the Nazi invasion of the Soviet Union.