may 7, 1915 - The Lusitania is torpedoed by a German U-Boat
Description:
The British ocean liner Lusitania is torpedoed by a German U-boat off the southern coast of Ireland. It sinks in just 18 minutes, and nearly 1,200 people are killed, including 128 U.S. citizens. The ship was carrying over 170 tons of rifle ammunition and artillery shells, thus Germany felt justified in treating the Lusitania as a target in a declared war zone.
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