There was fighting in many different areas (fronts). The French and British fought the Germans on the Western Front in France and Belgium. Germany had tried to defeat France quickly, but were stopped in the First Battle of the Marne. After that, most of the fighting here was trench warfare. The Russians fought the Germans and Austro-Hungarians on the Eastern Front in Central and Eastern Europe. Fighting here was not trench warfare but mobile warfare. The other main areas of fighting were in the Middle East, in the Gallipoli region of Turkey and between Italy and Austria-Hungary. Fighting also took place in Africa, China, and at sea as well as in the air. World War I was the first major war where tanks, airplanes, and submarines (or U-boats) were important weapons.