On October 15, 1917, the U. S. destroyer _Cassin_ was patrolling off the south coast of Ireland; when about 20 miles south of Mine Head, at 1.30 p. m., a submarine was sighted by the lookout aloft four or five miles away, about two points on the port bow. The submarine at this time was awash and was made out by officers of the watch and the quartermaster of the watch, but three minutes later submerged. The _Cassin_, which was making 15 knots, continued on its course until near the position where the submarine had disappeared. When last seen the submarine was heading in a south-easterly direction, and when the destroyer reached the point of disappearance the course was changed, as it was thought the vessel would make a decided change of course after submerging. At this time the commanding officer, the executive officer, engineer officer, officer of the watch, and the junior watch officer were all on the bridge searching for the submarine. [Sidenote: Torpedo sighted running at high speed.] [Sidenote: Torpedo strikes destroyer and depth charges also explode.] At about 1.57 p. m. the commanding officer sighted a torpedo apparently shortly after it had been fired, running near the surface and in a direction that was estimated would make a hit either in the engine or fire room. When first seen the torpedo was between three or four hundred yards from the ship, and the wake could be followed on the other side for about 400 yards. The torpedo was running at high speed, at least 35 knots. The _Cassin_ was maneuvering to dodge the torpedo, double emergency full speed ahead having been signaled from the engine room and the rudder put hard left as soon as the torpedo was sighted. It looked for the moment as though the torpedo would pass astern. When about fifteen or twenty feet away the torpedo porpoised, completely leaving the water and shearing to the left. Before again taking the water the torpedo hit the ship well aft on the port side about frame 163 and above the water line. Almost immediately after the explosion of the torpedo the depth charges, located on the stern and ready for firing, exploded. There were two distinct explosions in quick succession after the torpedo hit. [Sidenote: Ingram's sacrifice saves his comrades.] But one life was lost. Osmond K. Ingram, gunner's mate first class, was cleaning the muzzle of No. 4 gun, target practice being just over when the attack occurred. With rare presence of mind, realizing that the torpedo was about to strike the part of the ship where the depth charges were stored and that the setting off of these explosives might sink the ship, Ingram, immediately seeing the danger, ran aft to strip these charges and throw them overboard. He was blown to pieces when the torpedo struck. Thus Ingram sacrificed his life in performing a duty which he believed would save his ship and the lives of the officers and men on board. Nine members of the crew received minor injuries.