The Germans felt they had done their part to warn Americans about the danger of overseas travel. The German government purchased advertisement space in American newspapers warning that Americans who traveled on ships carrying war contraband risked submarine attack. When the Lusitania departed New York, the Germans believed the massive passenger ship was loaded with munitions in its cargo hold. On May 7, 1915, a German U-boat torpedoed the ship without warning, sending 1,198 passengers, including 128 Americans, to an icy grave. The Lusitania, as it turned out, was indeed carrying over 4 million rounds of ammunition.
President Wilson was enraged. Wilson's Secretary of State, William Jennings Bryan, recommended a ban on American travel on any ships of nations at war. Wilson preferred a tougher line against the German Kaiser. He demanded an immediate end to submarine warfare, prompting Bryan to resign in protest. The Germans began a 2-year practice of pledging to cease submarine attacks, reneging on that pledge, and issuing it again under U.S. protest.

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