Cherbourg Harbor was the key to the success of the D-Day offensive. If the Allied Forces were denied it as a port of entry for vital armaments and supplies, their campaign would be strangled to death by starvation or Wehrmacht counter-attack. They dragged the man they called The Sergeant -- C. J. Mahoney, code-name: Parrot -- a rough, tough son-of-a-gun, fresh from the hospital and a wild affair with a virginal young nurse, back to the battlefront to save the harbor. His assignment was simple: with five men, break into an impregnable Nazi fortress guarded by a regiment. Then disarm the detonators that would blow Cherbourg Harbor -- and the Sergeant -- to hell and gone ...