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This is the true story of two members of England's Army Dental Corps, Sgt. Peter King (Kenneth Cranham), a World War I veteran looking to keep on fighting, and Private Leslie Cuthbertson (Leo Bill), a wet-behind-the-ears trainee, whose dedication to helping the war effort during World War II inspired them to leave their posts and attempt to join the war effort in France. Sneaking into occupied territory in 1942, the two dentists found a German radar station, a part of which they successfully destroyed, but their efforts caused them to be chased by the enemy through dangerous territory. The most dangerous opposition to their patriotism manifested itself, however, when they made their way back to English territory, where they were now branded as deserters and liars...