What happened on February 21 during the U.S. Civil War?

As Paul Harvey used to say Here is the rest of the story [or at least some significant aspects]
"Confederate Brigadier General Henry Hopkins Sibley envisioned that he would invade New Mexico with his army, defeat Union forces, capture the capital city of Santa Fe and then march westward to conquer California and add it to the territory of the Confederacy. Sibley's first step was to gather an army in El Paso, Texas and lead it north along the Rio Grande with the objective of capturing Fort Craig and the supplies in the fort and defeating the Federal army under Colonel Edward Canby. On Jan 3, 1862, Sibley left El Paso with three regiments and one partial regiment of mounted Texans comprising 2,510 officers and men. Fort Craig, 140 miles (225 km) north of El Paso, was the major obstacle in his path. Canby awaited him there with 3,800 men of whom most were infantry. Only 1,200 of Canby's men were seasoned soldiers. The remainder consisted of 2,000 New Mexican volunteers, 100 Colorado volunteers, and 500 militia. Kit Carson commanded the First Regiment of New Mexican volunteers."
Aftermath of the battle
Left in possession of the battlefield, the Confederates gained the victory but had suffered substantial casualties, reporting 36 killed, 150 wounded, and one missing out of 2,590 men. Due to the strength of the fort's walls, Sibley decided to abandon his attempt to capture the fort and instead continued northwards towards Albuquerque and Santa Fe, where he hoped to capture much needed supplies. However, he was severely hampered by the losses in horses and mules from the battle, which forced him to dismount the 4th Texas as infantry and to destroy some supplies and wagons.
Canby reported that his forces had 3 officers and 65 men killed/3 officers and 157 men wounded/1 officer and 35 men missing for a total of 264. He also had additional missing and deserters, mostly deserters, thus suffering a 16 percent casualty rate, including deserters, of about 432 men out of 2,800 men engaged. Considering himself to be outnumbered, he chose not to pursue Sibley, instead sending mounted detachments of New Mexico volunteers against the Confederates' rear for harassment. He would remain with the main body at Fort Craig to cut off the Confederates' supply line and to intercept reinforcements for Sibley, eventually hoping to pin the main Confederate main body between himself and Union reinforcements from Fort Union.
Neither Sibley nor Canby received high marks for their generalship during the battle. Sibley was indisposed by alcohol and illness and spent most of the day riding in an ambulance. Col. Green was the de facto commander and it was his aggressive attack on Canby's center and left that won the battle. Canby blamed the New Mexican volunteers, mostly Hispanics, for his loss—but his decision to reinforce his right while weakening his center and left was the real cause of the Union defeat. On Canby's right wing, Kit Carson's regiment of New Mexican volunteers saw only limited action but comported itself well. The volunteers were advancing and thought they were winning the battle. They were incredulous when Canby gave the order to retreat.
The battle represented Canby's low point in his military career and Sibley's high point. Both men would go opposite directions to the terms of reputation after the battle. It was rumored following the battle that the two commanders of these battles, Canby and Sibley, who had been allies and trained together earlier, might have actually been brothers-in-law. However, research showed that there is little if any evidence that they were related by marriage. LTC (Join to see) SGT John " Mac " McConnell
https://en.wikipedia.org/wiki/Battle_of_Valverde

Another good piece of knowledge. Thank you for sharing!

I always wondered if the Confederates attacked west. In the classic Clint Eastwood Movie 'THE GOOD, THE BAD AND THE UGLY' there was a battle in the west that somewhat describes what happened today in history. I am not sure if they had gattling guns like in this movie. The attack scene taking the bridge is missing here.https://www.youtube.com/watch?v=Ryo8RtIYBnU