Stunt pilot, Derek Piggott, flew both Stachel's and Von Klugermann's planes for the bridge storming scene. With multiple camera angles (including one from a trailing helicopter) Piggott actually flew under the bridge over twenty times. To prove that the sequence was real, sheep were placed in the field next to the bridge so that they would scatter as the plane approached. However, as can be seen in the continuity, by the 20th take the sheep had become blasé and didn't scatter any more.