'Masters of the Air' is a narrative history of the bomber war in World War Two. The U.S. had two air forces conducting strategic bombing in Europe during the war, the Eighth and the Fifteenth. The Eighth was the more powerful and was the one that bombed Germany. Masters of the Air is the story of the Eighth Air Force. The American bomber war began in the summer of 1942 with a strike by a dozen Flying Fortresses (B-17s), or 'Forts,' as they were called, against Rouen, then occupied by the Germans. It ended in the spring of 1945 with a succession of thousand-bomber terror attacks against Berlin, Leipzig, Dresden and other cities in Germany.