Thunderbolt!

Thunderbolt is a 1947 film directed by William Wyler and John Sturges which documented the American aerial operations of Operation Strangle in World War II, when flyers of the Twelfth Air Force based on Corsica successfully impeded Axis supply lines to the Gustav Line and Anzio beachhead. The film was originally shot in 16mm by members of the Army Air Forces. The 12th Combat Camera Unit recorded the combat footage using cameras mounted on some of the P47s and a B25 medium bomber equipped as a camera ship to accompany the fighters.

The film opens with an introduction by James Stewart, who quips that 1944 has become ancient history, and reads a message from postwar Army Air Forces commander Gen. Carl Spaatz that, even though the units in the picture happen to be American, the mission depicted could easily have been an RAF mission, and indeed belongs to all people who desire freedom.Some of the P47 aircraft were modified with cameras a pair mounted in the cockpit behind the pilot to film both ahead and behind the aircraft, under the wing, in the wheel well of the landing gear, on the instrument panel to film the pilot, or in the guns, synchronized to film when the guns fired. n ........

Source: Wikipedia