The German offensive on Stalingrad was originally intended to secure the Wehrmacht's flanks, but it stalled dramatically in the face of Stalin's order: "Not a Step Back!" The Soviets' resulting tenacious defense of the city led to urban warfare for which the Germans were totally unprepared, depriving them of their accustomed maneuverability, overwhelming artillery fire, and air support--and setting the stage for debacle. Armageddon in Stalingrad...