The story of modern warfare is often told through the lens of great battles and charismatic generals, but the real revolution has been mechanical. From the thundering Soviet tank armies that rolled across Eastern Europe in World War II to the autonomous drone swarms being developed in military laboratories today, the nature of combat has been transformed by machines that fight faster, farther, and increasingly without direct human control. Soviet armored doctrine reshaped twentieth-century warfare in ways that most people never fully appreciated. The Red Army did not simply build a lot of tanks. It developed an entirely new philosophy of war called deep battle, which used massive concentrated armored formations to punch through enemy lines and then race hundreds of miles into the rear, destroying supply networks, command centers, and reinforcements ...