As First Lord of the Admiralty, Churchill organized the Dardanelles Campaign, the first large-scale, amphibious invasion in modern history. The campaign intended to weaken the German war effort by knocking their ally, the Ottoman Empire, out of the war. In spite of Churchill’s daring and ambitious thinking, the plan failed, as British units were mired in another bloody stalemate with hundreds of thousands of casualties. While Gallipoli, as the battle became known, went down in history as Churchill’s worst failure, it provided crucial lessons for the Normandy invasion of France in 1944. Churchill served the rest of the First World War with honor as an officer fighting on the Western Front.