The captured Dmitry Karbyshev, a former tsarist officer, spoke fluent German and knew all about the Soviet fortifications. The Third Reich stopped at nothing to get him to talk. Lieutenant General of the Engineering Corps Dmitry Mikhailovich Karbyshev was one of the most valuable personnel in the Red Army. When Germany invaded the USSR in 1941, the 60-year-old commander had already seen four wars and won numerous tsarist and then Soviet medals. Karbyshev demonstrated immense courage on the battlefield during the Russo-Japanese War of 1904-05, and later distinguished himself as a highly capable fortifier. During the Russian Civil War, he...