Writing in the 1920s, Winston Churchill argued that the First World War on the Eastern Front was “incomparably the greatest war in history. In its scale, in its slaughter, in the exertions of the combatants, in its military kaleidoscope, it far surpasses by magnitude and intensity all similar human episodes.” It was, he concluded, “the most frightful misfortune” to fall upon mankind “since the collapse of the Roman Empire before the Barbarians.” Yet Churchill was an exception, and the war in the east has long been seen as a sideshow to the brutal combat on the Western Front. Finally, with The Eastern Front—the first major history of that arena in fifty years—the acclaimed historian Nick Lloyd corrects the record. Drawing on the latest scholarship as well as eyewitness reports, diary entries, and memoirs, Lloyd moves from the great battles of 1914 to the final collapse of the Central Powers in 1918, showing how a local struggle between Austria-Hungary and Serbia spiraled into a massive conflagration that pulled in Germany, Russia, Italy, Romania, and Bulgaria. The Eastern Front was a vast theater of war that brought about the collapse of three empires and produced almost endless suffering. As many as sixteen million soldiers and two million civilians were killed or wounded in enormous battles that took place across as much as one hundred kilometers. Unlike in the west, where stalemate ruled the day, the war in the east was fluid, with armies embarking on penetrating advances. Lloyd narrates the repeated invasions of Serbia as well as the great battles between Russian, German, and Austrian forces at Tannenberg, Komarów, Gorlice–Tarnów, and the Masurian Lakes. All along, he takes us into the strategy of the generals who decided the war’s course, from the Germans Ludendorff and Hindenburg to the Austro-Hungarian chief, Conrad von Hötzendorf, to the brilliant Russian Brusilov. Perhaps the most radical aspect of the struggle in the east was that the violence was not confined to combatants. The Eastern Front witnessed calculated attacks against civilians that ripped the ethnic and religious fabric of numerous societies, paving the way for the horrors of the Holocaust. Lloyd’s magisterial, definitive account of the war in the east will fundamentally alter our understanding of the cataclysmic events that reshaped Europe and the world.