Seventy years ago, World War 2 was in full cry. American was in combat across the Atlantic and Pacific Oceans. In Europe, during 1943, the US Army Air Force was engaged against Hitler's Germany. The fall was a crucial time for battle, and October was a cruel month.
Defeating an enemy only with air power was experimental back then. The American plan was this: equip large bomber with heavy machine guns, fly them in a tight formation with hundreds of identical planes and no long range fighters as escorts. Could it work?