The First Battalion's final midnight barrage blows the Nazis off the banks of the Moselle, thanks to Sergeant C. J. Mahoney and his kill-crazy sidekick Cranepool. After an R&R of both pleasure and pain, the Sergeant itches for action — and action he gets when Patton launches a desperate offensive: seize the city of Metz, the key to the Siegfried Line! But enemy snipers, mortars and artillery are chewing up the advancing Third Army, and the Sergeant battles his way through the raining hell on a deadline do-or-die mission. With nothing but guts and grenades, Mahoney slips into the occupied city to destroy Hitler's inhuman weapon of mass slaughter — but first he has to survive the 'invisible' and bloodthirsty Nazi death squad! And if the Sergeant fails ... Patton fails!