The beginning of World War One was marked the breakdown of the western powers’ war plans. Leaders on both sides experienced surprises, shocks, and the failure of plans. The first few months saw shocking violence on a scale never experienced before, at least not in Western Europe. During the first few months of the war, an average of 15,000 lives were lost each day. (five times as much as the worst day in the Civil War). This happened at the Battle of the Marne, fought from September 6 to 12 in 1914. The Allies won a victory against the German armies in the West and ended their plans of crushing the French armies with an attack from the north through Belgium. Both sides dug in their trenches for the long war ahead.