How did the First World War differ from previous wars?

When the Germans invaded Belgium in August 1914, they and everyone else thought that the war would be short and relatively painless. Many sincerely believed that “the boys will be home by Christmas.” They were wrong. On the western front in France and the eastern front in Russia, the belligerent armies bogged down in a new and extremely costly kind of war, termed total war by German general Erich Ludendorff. Total war meant new roles for soldiers and civilians alike. At the front, total war meant lengthy, deadly battles fought with all the destructive weapons a highly industrialized society could produce. At home, national economies were geared toward the war effort. Governments revoked civil liberties, and many civilians lost lives or livelihoods as occupying armies moved through their towns and cities. The struggle expanded outside Europe, and the Middle East, Africa, East Asia, and the United States were all brought into the maelstrom of total war.