John Gibbon

John Gibbon (April 20, 1827 – February 6, 1896) was a career United States Army officer who fought in the American Civil War and the Indian Wars.
When the Civil War began, Gibbon was serving as a captain of Battery B, 4th U.S. Artillery at Camp Floyd in Utah. Although his father owned slaves and several of his family members (three brothers, two brothers-in-law and his cousin J. Johnston Pettigrew) served in the Confederate military, Gibbon remained loyal to the Union.
At the Battle of Gettysburg in July, he commanded the 2nd Division, II Corps and temporarily commanded the corps on July 2 and early July 3, 1863, while Maj. Gen. Winfield Scott Hancock was elevated to command larger units.
During the Appomattox Campaign, he helped block the Confederate escape route at the Battle of Appomattox Courthouse, resulting in Gen. Lee's surrender. He was one of three commissioners for the Confederate surrender.
Gibbon stayed in the army after the war. He reverted to the regular army rank of colonel fighting in the Indian Wars.
Gibbon was not close by during the battle of the Little Bighorn which resulted in the deaths of Custer and some 261 of his men, but Gibbon's approach on June 26 probably saved the lives of the several hundred men under the command of Major Marcus Reno who were still under siege. Gibbon arrived the next day and helped to bury the dead and evacuate the wounded.
https://en.wikipedia.org/wiki/John_Gibbon