David M. Glantz is the author of The Battle for Leningrad, 1941–1944, Stumbling Colossus: The Red Army on the Eve of World War, Zhukov’s Greatest Defeat: The Red Army’s Epic Disaster in Operation Mars, and When Titans Clashed: How the Red Army Stopped Hitler, all published by Kansas.Jonathan M. House is professor of military history at the U.S. Army Command & General Staff College and the author of Towards Combined Arms Warfare and Military Intelligence, 1870–1991. Glantz and House also coauthored When Titans Clashed: How the Red Army Stopped Hitler.