Harder (SS-257) Assigned to keep a close watch on the enemy's mobile fleet anchored at Tawi Tawi, the USS Harder sank five destroyers in six days, leading the Japanese admiral to believe his anchorage was surrounded by a whole fleet of submarines. When he moved his ships out to sea, 24 hours ahead of his operational plan, the U.S. Fifth Fleet struck and, in the battle of the Philippine Sea, the Japanese Navy was dealt one of the most crippling blows of the war. The USS Harder's captain, Samuel D. Dealey, was posthumously awarded the Congressional Medal of Honor for this action.