During the Red Army’s first major war, its ill-equipped, starving troops fought fellow countrymen and an invasion force of 10,000 American, British, and French soldiers in the freezing wastelands of Siberia and the Ukraine. A brutal and fast-moving war, sieges were broken by fiercely armored trains immortalized in Dr. Zhivago. Land battles in the frozen east of Europe such as Kazan and Kakhovka were very different from those fought in the west—as the Nazis would also learn to their cost 20 years later.