Analysis of information sources in references of the Wikipedia article "Pierre Laureys" in English language version.
In one scene they needed some Spitfires that attacked a German column. Through the French ex-wartime pilot, Pierre Laureys, they rented a couple of Spitfires. Laureys restored the Spitfires (MH415, MK297, and MK923) and flew self a Spitfire when they shot the attack scene, just as he did with 340 Squadron on June 6th, 1944, low and very fast!