Killed at the Bloody Angle, Spotsylvania Court House, VA, 12 May 1864.
“Adjutant Peel had thrown aside his sword and with a very fine rifle, captured from the enemy, he was shooting as rapidly as he could reload. He fell, shot through the head at the foot of an oak tree which had been cut down by deadly missiles. His body was found by his brother, Dr. R. H. Peel, who was then surgeon of the regiment, and it was buried after dark. The stump of this oak tree at the root of which Adjutant Peel fell measured at the time Twenty-two inches in diameter, and is now among the war relics in the museum at Washington City. We buried Adjutant Peel’s body beside his colonel, the gallant T. J. Hardin, who was also killed in the battle.”
Excerpt from Confederate Veteran, Volume 10, Page 367: “THE LAST ROLL.”
Peel’s transcribed war diary is available here: http://freepages.family.rootsweb.ancestry.com/~peel/peeldec.html