World War II: Secrets from Above

+ Summer 1940: Fierce dogfights fill the skies over Southern England, as the pilots of the RAF defend the island from ferocious German bombers.

The longest campaign of the war pits the deadly stealth of the Nazi U-boats against the code-breaking genius and long-range bombers of the Allies.

The Allies have taken the beaches of Northern France. Now they face a brutal fight through enemy territory in a bid to liberate Europe.

September 1944: Thousands of troops drop from the skies over the Netherlands, as the Allies launch the largest airborne assault in history.

From the audacious beach landings at Salerno to the mountaintop stand-off at Monte Cassino, the Allies battle to liberate Italy from the Nazis.

From the first shots fired to the horrors of Auschwitz, the battle to free Poland from the grip of the Nazis is one of the toughest of the war.