For the British Empire and its allies of the Great War, 1917 was a year marked by crises. But here and there glimmers of light pierced the gloom. Soldiers began solving the problems posed by trench warfare. The dominions asserted themselves in the councils of imperial power. And the US finally entered the war. This book examines the British imperial war effort during the most pivotal and dynamic twelve months of the war. Written by internationally recognized historians, its chapters explore military, diplomatic, and domestic aspects of how the empire prosecuted the war. Their rich, nuanced analysis transcends narrow, national viewpoints to provide a multi-faceted perspective of events that laid the groundwork for victory.