In the English-speaking world the First World War is too often portrayed as a conflict between Britain and Germany. The majority of books focus on the Anglo-German struggle, and ignore the part played by the French, who for most of the war provided the bulk of the soldiers fighting against the central powers. This important book joins the growing collection of works offering an overdue assessment of the French contribution to the War. Drawing on French primary sources, the book is an in-depth battle narrative and analysis, and a work on the tactical evolution of the French army in Spring 1915 as it endeavored to come to grips with trench warfare.