Advanced flash-spotting, precision sound-ranging grids, superior shell ballistics, and out-ranging elite German artillery from 14 miles away. Welcome to The American Trick That Let the 155mm Long Tom Hit German Guns From 14 Miles Away. In this gripping World War II military history and tactics documentary, we explore the tactical ingenuity and technological edge that allowed the American 155mm Gun M1 (“Long Tom”) to systematically dominate and silence German artillery batteries across the European theater.