It's 1942 and the Nazis have occupied France. The Battle of Britain is being fought in the skies over London. The British have been routed at Dunkirk--and two army dentists have decided to launch their very own private invasion of France. Based on a true story, Sergeant Peter King of the Army Dental Corps, who's too old to fight, and Private Leslie Cuthbertson, a trainee dental mechanic in the Corps, are both thrown together by their passionate desire to see active service. Armed with just two revolvers and a dozen grenades, King persuades Cuthbertson to join him on a mission to Nazi occupied France.