Germany War II in Europe. In response to Hitler's actions, two days later, on 3 September, after a British ultimatum to Germany to cease military operations was ignored, Britain and France declared war on Germany. In the spring of 1940, Germany conquered Denmark and Norway, the Netherlands, Belgium, Luxembourg, and France forcing the French government to sign an armistice after German troops occupied most of the country. The British repelled German air attacks in the Battle of Britain in the same year. In 1941, German troops invaded Yugoslavia, Greece and the Soviet Union. By 1942, Germany and other Axis powers controlled
France–Germany relations Austen Chamberlain enthusiastically agreed. France realized that its occupation of the Ruhr Had caused more financial and diplomatic damage that was worth, went along with the plan. The conference of foreign ministers they convened in the Swiss resort of Locarno and agreed on a plan. The first treaty was the most critical one: a mutual guarantee of the frontiers of Belgium, France, and Germany, which was guaranteed by Britain and Italy. The second and third treaties called for arbitration between Germany and Belgium, and Germany and France, regarding future disputes. The fourth and fifth were similar arbitration treaties between Germany