Which major battle was fought during the New Mexico Campaign of the Civil War?

The Battle of Glorieta Pass is recognized as the pivotal engagement during the New Mexico Campaign of the Civil War. Fought in March 1862, this battle was significant because it essentially thwarted the Confederate forces' attempt to seize control of New Mexico and expand their influence into the Western territories. The Union victory at Glorieta Pass, achieved through strategic maneuvers and a successful flanking attack, played a crucial role in repelling the Confederate invasion and securing Union control over the region.

Understanding the importance of this battle also highlights how it impacted the overall momentum of the war in the West, showcasing the Union's ability to defend key territories against Confederate forces. The other battles listed, while part of the broader military actions in New Mexico, did not have the same level of strategic importance or lasting impact on the overall course of the Civil War in the region as the Battle of Glorieta Pass did.