The Battle of Glorieta Pass was fought March 26–28, 1862 in the northern New Mexico Territory, by Union and Confederate forces during the American Civil War. While not the largest battle of the New Mexico campaign, the Battle of Glorieta Pass ended the Confederacy's efforts to capture the territory and other parts of the western United States. The battle took place at the eponymous mountain pass in the Sangre de Cristo Mountains, in what is now Santa Fe County, New Mexico.