the water routes to Britain were war zones where any ship, neutral or otherwise, was a target. Nevertheless, international route law required giving the crew and passengers an opportunity to get into their lifeboats. In May 1915, a U-boat, without warning, torpedoed the British passenger liner Lusitania; it sank in 18 minutes, drowning over 1000 helpless civilians including over 100 Americans. Vigorous protests by American President Woodrow Wilson forced Berlin to abandon unrestricted submarine warfare. With victory over Russia in 1917, the German high command now calculated it could finally have numerical superiority on the Western Front. Planning for a massive spring offensive in 1918, it resumed the sinking of all merchant ships without warning, even if they were flying the American flag. The US entered the war alongside the Allies (without officially joining them), and provided the needed money and supplies to sustain the Allies' war efforts. The U-boat threat was ultimately defeated by a convoy system across the Atlantic. On other fronts, the British, French, New Zealanders, Australians, and Japanese seized Germany's colonies. Britain fought the Ottoman Empire, suffering defeats in the Gallipoli Campaign and in Mesopotamia (Iraq), while arousing the Arabs who helped expel the Turks from their lands. Exhaustion and war-weariness were growing worse in 1917, as the fighting in France continued with no end in sight. After defeating Russia, the Germans tried to win in the spring of 1918 before the millions of American soldiers arrived. They failed, and they were overwhelmed by August and finally accepted an Armistice on 11 November 1918, that amounted to a surrender British society and government were radically transformed by the repeated calls for manpower, the employment of women, the dramatic increase in industrial production and munitions, price controls and rationing, and the wide and deep emotional patriotism dedicated to winning the war. Parliament took a backseat, as new departments bureaus committees and operations were created every week, experts were consulted, and the prime minister's Orders in Council replaced the slow legislative process. Even after peace arrived, the new size and dynamism had permanently transformed the effectiveness of British government. David Lloyd George, also a Liberal, was the high-powered Minister of Munitions who replaced Asquith in late 1916. He gave energy and dynamism to the war effort with his remarkable ability to convince people to do what he wanted and thus get ideas put into actual useful high-speed motion.