Short answers, pulled from the story.
The Battle of Glorieta Pass was fought March 26-28, 1862, in the Sangre de Cristo Mountains of northern New Mexico Territory. Although Confederate forces won the main engagement at Pigeon's Ranch on the 28th of March, a Union detachment simultaneously destroyed their entire supply train at Johnson's Ranch, forcing a retreat that ended the Confederate New Mexico campaign permanently.
Confederate Brig. Gen. Henry Hopkins Sibley aimed to capture the gold and silver mines of California and the Colorado Territory and seize Pacific seaports in Southern California. Controlling those ports would allow the Confederacy to break the Union naval blockade. The New Mexico campaign was the westernmost military operation of the Civil War and the South's only genuine attempt to conquer and occupy Union territory in the West.
Maj. John M. Chivington led the Union force that attacked the supply train at Johnson's Ranch on the 28th of March 1862. Lt. Col. Manuel Chaves of the 2nd New Mexico Infantry had located the train with his scouts and informed Chivington. The raiders burned all 80 wagons, spiked the cannon, and killed or drove off roughly 500 horses and mules.
The Confederate force was commanded overall by Brig. Gen. Henry Hopkins Sibley, with Maj. Charles L. Pyron and Col. William Read Scurry leading at the pass. The Union was commanded overall by Col. Edward Canby, with Col. John P. Slough and Maj. John M. Chivington leading at Glorieta.
Credit was disputed. Maj. Chivington received wide recognition, but the New Mexico Territorial Legislature in January 1864 asked President Lincoln to promote William H. Lewis and Asa B. Carey for distinguished service without naming Chivington. The Rio Abajo Press of Albuquerque reported that Lewis had led the actual attack while Chivington was "viewing the scene from afar."
The Glorieta Pass Battlefield is managed by Pecos National Historical Park and designated as a National Historic Landmark. The park's Pigeon's Ranch unit covers roughly 20 percent of the total battlefield; the remaining 80 percent is in private ownership. As of mid-2023, the American Battlefield Trust and its partners had acquired and preserved 19 acres.