Howard Keel, Tina Louise, Warner Anderson, Earl Holliman, Carleton Young, Burt Reynolds, & Marty Ingels as Pinhead. Tina Louise, a Mata Hari type spy for the Nazis, inflitrates a small armored unit of the 7th U.S. Army which is attempting to hold off a German attack in the Vosges Mountains

In northeastern France, during World War II, a U. S. Army patrol finds a wounded girl, Alexandra, lying on a road in the Vosges Mountains. Unaware that she is a German spy, they move her into an abandoned house and nurse her back to health. She quickly ingratiates herself with the men, offers her services as an interpreter to Army Intelligence, and then passes what information she picks up to the German espionage network. Consequently, the unit is unable to detect any Germans in the area, although the group commander, Colonel Devlin, is certain they are present. Eventually, two German soldiers are captured, and they reveal that a large German force is nearby. When Colonel Devlin learns that Alexandra has been working for Intelligence, he becomes suspicious of her and orders his men to prepare for an attack. The Germans attempt to create disturbances by seeing to it that cognac is made available to the American soldiers, but Devlin has the liquor confiscated. A short time later, the Germans attack; and Alexandra joins in the battle, killing two American soldiers with a shotgun. When young Sergeant Mike, who has fallen in love with Alexandra, sees her shoot Skee, his rival for her affections, he kills her with a blast of machine-gun fire. Reinforcements soon arrive to drive off the enemy and help Devlin hold his position.