In the summer of 1940, Adolf Hitler began Operation "Sea-Lion", or better known as the Battle of Britain. This was the plot to destroy the British RAF so that a German landing on the beaches of England and an air attack was possible. Due to the failure of the Battle of Britain campaign, the course of the war was changed in favor of the Allies and Hitler's plan for European domination was halted. The early stages of the war were dominated by Germany, which attacked Europe in rapid succession. Ground forces quickly overwhelmed European nations with aircraft support. The Luftwaffe quickly gained air superiority. In early May 1940, Norwegian debates began to question the competence of the current British Prime Minister, Neville Chamberlain. On May 10, 1940, Germany invaded France and on the same day Winston Churchill became the new British Prime Minister. Churchill's first plan of action was to send support to forces in France, so he sent poorly trained squadrons to France, although he had objections from the RAF commander, Hugh Dowding. The superiority of the Luftwaffe pilots proved fatal for the squadrons in France. Adolf Hitler was so confident that he would negotiate peace with Britain that he never made plans for an amphibious landing. However, on 11 July, the grand commander of the German navy, Erich Raeder, told Hitler that an amphibious landing on Britain was a last resort. The invasion force was scheduled to depart from bases in France, cross the channel and land on British soil. But it soon became clear that the British Royal Navy was still a force to be reckoned with. The only way to ensure the safe passage of the landing forces was to use slow heavy bombers and dive bombers to destroy the ships. And the only way to… mid-paper… was to reassign crews to the Eastern Front. In doing so, he effectively ended Operation Sea-lion. The effects of the entire campaign changed the entire outlook on the course of the war. For the British, this demonstrated the courage of the British people who, when threatened, resist and fight. It also changed the way Germany viewed Britain as an enemy. This battle showed them that Britain was not a weakling and that they needed to be handled with caution. The battle also changed Americans' outlook. During the battle, many people believed that Britain could not survive a prolonged fight against the might of Germany. However, after the battle, Theodore Roosevelt wanted a second opinion. He then sent a United States ambassador on a short trip to Britain. Roosevelt became convinced that the nation could survive and that it needed to be supported