Subtitle Being a Narrative of the Torpedoing and Sinking of the RMS Lusitania by a German Submarine off the Irish Coast May 7, 1915. On May 7, 1915, the German U-boat U-20 fired a torpedo into the side of the passenger liner R.M.S. Lusitania as it passed the Old Head of Kinsale in Ireland on its way to Liverpool, England.