Good Afternoon, Mustang Greg;
I would have to say the Battle of Stanwix Station, on or about 15 March 1862, immediately west of present-day Phoenix, Arizona; in which a detachment of Federal Troops under Captain McCleave engaged the Arizona Volunteers, an independent CSA Company, Captain Sherod Hunter, commanding.
I have the honor to remain,
Your Obedient Servant,
Bvt. Captain Malachi Thorne