First Battle of Mesilla: The Opening Shot in the Southwest

On July twenty-fifth, eighteen sixty-one, the Civil War arrived in the Mesilla Valley. What happened here was a small battle with enormous consequences for the entire Southwest.

Lieutenant Colonel John Baylor had led a battalion of the Second Texas Mounted Rifles north from Fort Bliss into New Mexico Territory, aiming to seize the Rio Grande corridor and push Confederate control all the way to California. His men had already occupied Mesilla, and he was expecting a Union counterattack. He was right to expect it.

Major Isaac Lynde marched three hundred and eighty Union regulars from nearby Fort Fillmore to drive the Confederates out. He approached Mesilla, demanded Baylor surrender, and when Baylor refused, opened fire with mountain howitzers. The artillery shells fell short and did little damage. Baylor's riflemen returned fire from behind the town's adobe buildings. After a brief exchange, Lynde withdrew back to the fort, having taken casualties without dislodging the Confederates.

The Union's fumbled attack had consequences that rippled outward immediately. Emboldened by the victory, Baylor moved quickly. He intercepted and forced the surrender of Lynde's entire command just days later at San Augustine Springs, capturing about five hundred Union soldiers in one of the most embarrassing surrenders of the early war. On August first, he declared the creation of the Confederate Territory of Arizona, claiming all land south of the thirty-fourth parallel.

For a brief moment, the Confederacy controlled the Rio Grande from Fort Bliss to Mesilla and was positioning to drive toward California and its gold. Union columns from Colorado and California eventually pushed the Confederates back. But the First Battle of Mesilla was the spark that set the entire Trans-Mississippi Southwest ablaze.