The Eastern Front of World War I is sometimes overshadowed by the fighting in the West. But the clashes between Imperial Germany and Tsarist Russia in East Prussia, Poland and Lithuania were every bit as gruelling for the participants as the great battles in Western Europe. In spite of the crushing German victory at Tannenburg in August 1914, the war in the East would grind on for two more years. Featuring full-color artwork, specially drawn maps and archive photographs, this study assesses the tactics, leadership and combat performance of German and Russian footsoldiers fighting in battles at Gumbinnen, Göritten and Mahartse, revealing the evolving nature of infantry warfare on the Eastern Front during World War I.