The entry of the USA into World War I spelt disaster for Imperial Germany. The massive superiority in men and materials which the Americans could provide meant that if Germany had any chance of winning the war she must do so quickly. Randal Gray describes how, using special 'Stormtrooper' units and high-mobility tactics, the Germans came within a hair's breadth of winning the war, providing a blow by blow account of the daily events of the battle. Although at first glance the Kaiserschlacht was Germany's greatest success of the First World War, in fact its ultimate failure consigned Germany to inevitable defeat.