It was a clear spring day, May 7, 1915, when a British ocean liner—the RMS Lusitania—slipped beneath the waves off the southern coast of Ireland. She had left New York six days earlier, bound for Liverpool, and was now just hours from her destination. On board were nearly two thousand souls—men, women, children, businessmen, families, and a significant number of Americans. The war in Europe had raged for almost a year, but for most Americans, the Atlantic still felt like a wide and safe buffer. That illusion was shattered in under twenty minutes.