The battle took place on April 15, 1862, and was a skirmish between a Union cavalry patrol consisting of 13 men and their commander from California and a party of 10 Confederate pickets from Tucson. (A "picket" is a group of troops placed forward of a position to warn against an enemy advance).
Accounts of the action vary depending on who you consult, so I won't try to give you a "play by play" of this very short (approximately two hour) battle, or even declare a winner.
Nevertheless, the consensus seems to be that three Union soldiers were killed; three were wounded; and three Confederate soldiers were captured.
Tuesday, January 3, 2012
Little-known fact: the western-most battle of the Civil War was fought in Arizona, near Picacho Peak, which is a smallish mountain (2000 ft elevation) between Tucson and Phoenix, south of Casa Grande, Arizona.