Based on the 2014 book "Churchill's Secret Warriors: The Explosive True Story of the Special Forces Desperadoes of WWII" by Damien Lewis.
Henry Cavill plays the historical figure who inspired Ian Fleming's James Bond. Cavill has long been a fan favorite to play Bond on screen.
Ian Fleming introduces himself, "Fleming. Ian Fleming." This is a nod to his fictional hero James Bond who, in many of the films in which he appears, introduces himself as "Bond. James Bond."
The actual Gus March-Phillips was killed in action eight months following the events in this movie.
Easter egg: U-96 from "Das Boot" makes an early appearance.