The production built ten full-size replicas of Horsa gliders to recreate the massive Allied airborne operation, but nature immediately turned the expensive set pieces into a logistical nightmare. A windstorm damaged almost all of the replicas, forcing the crew to repair seven or eight of them in haste before filming could continue. The surviving gliders were not merely fragile: they were tail-heavy and required support posts beneath their rear fuselages, which meant that camera angles had to be carefully selected to conceal the hardware. The replicas were towed at high speed behind a Dakota but never actually became airborne; only a two-seat Blaník sailplane was towed aloft for interior takeoff shots. The result was a spectacular illusion assembled from damaged mock-ups, hidden supports, and carefully controlled angles rather than a fleet of genuinely flying wartime gliders.
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