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. Blitzkrieg in the Past is a science fiction from American fantasy and science fiction writer David Wright OBrien. He had more than fifty-seven stories published in pulp magazines like Amazing Stories and Fantastic Adventures, most of them written under the different pen names.