General Sedgwick fell at the beginning of the Battle of Spotsylvania Court House, on May 9, 1864. His corps was probing skirmish lines ahead of the left flank of Confederate defenses and he was directing artillery placements. Confederate sharpshooters were about 1,000 yards (900 m) away and their shots caused members of his staff and artillerymen to duck for cover. 

Sedgwick strode around in the open and was quoted as saying, "What? Men dodging this way for single bullets? What will you do when they open fire along the whole line? I am ashamed of you. They couldn't hit an elephant at this distance." Although ashamed, his men continued to flinch and he repeated, "I'm ashamed of you, dodging that way. They couldn't hit an elephant at this distance." Just seconds later he fell forward with a bullet hole below his left eye. 

Sedgwick was the highest ranking Union casualty in the War. Although James B. McPherson was in command of an army at the time of his death and Sedgwick of a corps, Sedgwick had the most senior rank by date of all major generals killed. Upon hearing of his death, Grant, flabbergasted by the news, repeatedly asked, "Is he really dead?"