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The First Battle of Mesilla, was fought on July 25, 1861 at Mesilla in New Mexico Territory, in present-day Doña Ana County, New Mexico.
It was an engagement between Confederate and Union forces during the American Civil War. The battle resulted in a Confederate victory and led directly to the official establishing of a Confederate Arizona Territory, consisting of the southern portion of the New Mexico Territory. The victory paved the way for the Confederate New Mexico Campaign the following year.
https://en.wikipedia.org/wiki/First_Battle_of_Mesilla#:~:text=The%2....