Blitzkrieg in the Past

After a “short, dumpy bald-headed guy in civvies” installs an invention, a time transfer device, in a tank that proceeds into the Georgia wilderness on maneuvers, a lightning bolt send the tank and its three operators backward in time. Shortly afterward, they notice a single three-toes dinosaur footprint and disturbingly they hear the bloodthirsty scream of a very strange “bird.”