of what any American obstructionist organisation may prefer to believe, I tell you the blunt fact that the German submarine fired first upon this American destroyer without warning, and with the deliberate design to sink her. Declaring that Germany had been guilty of "an act of piracy," President Roosevelt announced what became known as his "shoot-on-sight" order: that Nazi submarines' "very presence in any waters which America deems vital to its defense constitutes an attack. In the waters which we deem necessary for our defense, American naval vessels and American planes will no longer wait until Axis submarines lurking under the water, or Axis raiders on the surface of the sea, strike their deadly blow—first." He concluded: The aggression is not ours. [Our concern] is solely defense. But let this warning be clear. From now on, if German or Italian vessels of war enter the waters, the protection of which is necessary for American defense, they do so at their own peril. . . . The sole responsibility rests upon Germany. There will be no shooting unless Germany continues to seek it. Senator David I. Walsh (Democrat–Massachusetts), isolationist Chair of the Senate Committee on Naval Affairs, scheduled a committee hearing to unearth the details of the incident, which prompted Admiral Harold R. Stark, Chief of Naval Operations, to issue a written report. Stark's account, made public in October 1941, confirmed that the Greer dropped its charges only after the submarine fired its first torpedo at it, but revealed that the Greer had gone in search of the submarine after its presence was noted by the British aircraft. Admiral Stark's report stated: At 0840 that morning, Greer, carrying mail and passengers to Iceland, "was informed by a British plane of the presence of a submerged submarine about 10 miles [(16 km)] directly ahead. . . . Acting on the information from the British plane the Greer proceeded to search for the submarine and at 0920 she located the submarine directly ahead by her underwater sound equipment. The Greer proceeded then to trail the submarine and broadcast the submarine's position. This action, taken by the Greer, was in accordance with her orders, that is, to give out information but not to attack." The British plane continued in the vicinity of the submarine until 1032, but prior to her departure the plane dropped four depth charges in the vicinity of the submarine. The