Squadrons of B-29s then assemble and the audience rides with them through a space of ocean as wide as the US from Mexico to Canada, special attention being given to the island Iwo Jima, which is midway through the journey, the base for P-51 fighters that will escort the bombers. The film then proceeds to the actual bombing of Japan, showing one of the B-29s in combat with Japanese fighters, dogfights between the escorting P-51s and Japanese aircraft and the destruction leveled on Tokyo by the B-29s' payload and subsequent strafing by the escort fighters.
