A tank designed in the early 1940s to fight Nazi Germany was not retired from active military service until 2018 in Paraguay. On paper the M4 Sherman looks like the undisputed underdog against German heavy armor, yet logistics, availability, and reliability win wars. This episode digs into a stack of historical and technical sources to understand the paradox of the Sherman, the mass-produced commuter car of the battlefield that went up against a handful of temperamental Ferraris.

We explore how the Sherman's weight, width, and height were dictated by rural American bridges, railway flat cars, and the dock cranes of New York Harbor, and how over 49,000 were built by locomotive companies, welding shops, Ford, and Chrysler with fully interchangeable parts. We examine General Leslie McNair's Tank Destroyer Doctrine, which held that tanks should ...