The statistics relating to the Battle of Kursk—the great showdown between Nazi Germany and Soviet Russia in July 1943—still have the power to astonish, even 70 years later. Almost 3 million men, a full eight thousand tanks, and nearly five thousand warplanes broke all records for both the costliest single day of aerial warfare and the largest tank battle in the history of mankind. If the Germans had broken through the Russian lines in the Kursk salient and scored a decisive victory over the Red Army, it is perfectly possible that they might have turned back the tide of war in their direction, despite their defeats at Moscow and Stalingrad in 1941 and 1942, respectively.