John Gregory Bourke (; June 23, 1846 – June 8, 1896) was a captain in the United States Army and a prolific diarist and postbellum author; he wrote several books about the American Old West, including ethnologies of its indigenous peoples. He was awarded the Medal of Honor for his actions while a cavalryman in the Union Army during the American Civil War. Based on his service during the war, his commander nominated him to West Point, where he graduated in 1869, leading to service as an Army officer until his death. Biography John G. Bourke was born in Philadelphia, Pennsylvania, to Irish immigrant parents, Edward Joseph and Anna (Morton) Bourke. His early education was extensive and included Latin, Greek, and Gaelic. When the Civil War began, John Bourke was fourteen. At sixteen he ran away and lied about his age; claiming to be nineteen, he enlisted in the Fifteenth Pennsylvania Volunteer Cavalry, in which he served until July 1865. He received a Medal of Honor for "gallantry in action" at the Battle of Stones River, Tennessee, in December 1862. He later saw action at the Battle of Chickamauga. His commander, Major General George H. Thomas, nominated Bourke for West Point. He was appointed cadet in the United States Military Academy on October 17, 1865. He graduated on June 15, 1869, and was assigned as a second lieutenant in the Third U.S. Cavalry. He served with his regiment at Fort Craig, New Mexico Territory, from September 29, 1869 to February 19, 1870. He served as an aide to General George Crook in the Apache Wars from 1872 to 1883. As Crook's aide, Bourke had the opportunity to witness every facet of life in the Old West—the battles, wildlife, the internal squabbling among the military, the Indian Agency, settlers, and Native Americans. Work Observer Bourke kept a diary in sequential journals throughout his adult life, documenting his observations in the West. He used these notes as the basis for his later monographs and writings. During his time as aide to General Crook during the Apache Wars, Bourke kept journals of his observations that were later published as On the Border with Crook. This book is considered one of the best firsthand accounts of frontier army life, as Bourke gives equal time to both the soldier and the Native American. Within it, Bourke describes the landscape, Army life on long campaigns, and