Torpedoed during Midway
During the Battle of Midway, Hammann came alongside the damaged Yorktown June 6, to transfer a damage control party. The destroyer then lay alongside, providing hose and water for fire fighting, power, and other services while tied up next to Yorktown. The salvage party was making excellent progress when the protective screen was penetrated by a Japanese submarine after noon on 6 June. Four torpedoes were loosed two missed, one passed under Hammann and hit Yorktown, and the fourth hit the destroyer amidships, breaking her back. As the debris from the explosion rained down and the ships lurched apart, it was apparent that the valiant Hammann was doomed. As she settled with sickening quickness life rafts were lowered and rescue efforts began by ships in company. The ship sank in just 4 minutes and following the sinking a violent underwater explosion caused many deaths in the water, bringing the toll in dead to over 80.