Comanche was rescued from the battlefield a few days after Custer's defeat and was transported by steamship down the Missouri River to Fort Lincoln, along with wounded and dying members of the Reno-Benteen group (a group that fought their own battle a few miles away, while Custer's 280 men were being wiped out). At Fort Lincoln, Comanche was cared for by a private in Keogh's Company, Gustave Korn.
Korn, it seems, led an interesting life. He was with Keogh and Custer at the beginning of the Battle of the Little Bighorn but his horse bolted and, after retrieving it, he joined the Reno-Benteen group and thus survived the battle. After returning to Fort Lincoln, Private (later Sergeant) Korn took care of Comanche for the next 14 years at Fort Lincoln and later at Fort Meade, South Dakota when the 7th Cavalry was transferred there. By the way, after Comanche returned from the Little Big Horn, orders were issued that no one should ever ride him again -- the only time in American history that the Cavalry ever issued such an order -- and no one ever did, not even Korn.
Sergeant Korn was killed in the last conflict of the Indian wars, the Battle of Wounded Knee in 1890, and was one of the few U.S. troops to die in that one-sided massacre. It's said that Comanche lost his will to live when Korn didn't return and he died a year later. Comanche was stuffed -- a rather odd fate for such a noble horse -- and can been seen today at the University of Kansas in Lawrence.