War began between Germany and France on August 3, 1914. Five weeks later, the German army had smashed its way to within 18 miles of Paris. There the battered French miraculously rallied their forces at the Marne River, and in a series of unexpected counterattacks, drove the Germans back. The Front was stabilized and shortly afterward developed into a continuous line of heavily fortified trenches zigzagging their way five hundred miles from the English Channel to the Swiss frontier. By 1916, after two grisly years of trench warfare, the battle lines had changed very little. Successful attacks were measured in hundreds of yards - and paid for in lives by hundreds of thousands.