A good old-fashioned adventure movie that is so stuffed with robust incidents and characters that you can relax and enjoy it without worrying whether it actually happened or even whether it's plausible.
Anyone with even a modicum of history awareness knows that Churchill was never kidnaped--which destroys much of the film's suspense. Director Sturges, however, is an excellent craftsman and, with the help of a very good cast, manages to make the proceedings entertaining.
Most performances [in this adaptation of the Jack Higgins’ novel] are first rate with Sutherland exuding great credibility as the Irishman, and Caine thoroughly convincing as the Nazi commander. Pleasence gives a standout lifelike interpretation of Himmler.
Eagle flops around trying to sustain a premise that defies suspenseful elaboration from the outset. No one with his wits about him believes the conspirators will succeed in capturing or shooting Churchill. More to the point, who would want them to? We're asked to suspend disbelief for the sake of a gimmick that not only insults common sense and general knowledge but also betrays old loyalties and convictions. [26 Mar 1977, p.B5]