Old Military Headquarters

🏛️The era

San Antonio has been a military town for as long as it has been a town. Spain fortified it, Mexico garrisoned it, and Texans fought and died at the Alamo. When Texas joined the United States in 1845, the city quickly became a key post for the U.S. Army on the southwestern frontier.

That role grew within a year. War with Mexico broke out in 1846, and San Antonio became a staging ground for American forces heading south. An army needs paperwork as much as powder: supply records, payrolls, orders, and correspondence. A two-story stone building on this site became the Army's administrative offices during the war years of 1846 and 1847.

Fifteen years later the country was splitting apart. Abraham Lincoln's election in 1860 set off a wave of secession across the South. In early 1861 Texas was moving toward leaving the Union, and the many Federal forts, arsenals, and supply depots scattered across the state suddenly became prizes.

👥People & events

The central figure is General David E. Twiggs, a long-serving U.S. Army officer and veteran of the Mexican War who commanded the Army's Department of Texas in early 1861. He was a Southerner by birth. As secession fever rose, he found himself in charge of a huge store of Federal property in a state that was preparing to leave.

On February 16, 1861, at this site, Twiggs surrendered roughly $1.6 million worth of Federal property to the forces of Confederate Texas. Armed Texas volunteers had come into San Antonio, and rather than fight, Twiggs handed over the government's holdings in the department. The timing is striking: Texas voters had not yet even ratified secession in the statewide referendum held a week later. The move stunned the North. The U.S. government soon dismissed Twiggs from the Army, and many Northerners regarded what he had done as betrayal.

Afterward the building served for about a year as headquarters for Texas military affairs. As the war went on, that work moved to Houston, Bonham, and Shreveport, following the shifting needs of the Confederacy's western command.

The stone building had a quieter later life as a hotel, the Vance House. It went from Army offices to the scene of a dramatic surrender to a place where travelers spent the night, a good example of how San Antonio's buildings kept getting reused as the city's history moved on.

🇺🇸Its place in the American story

Twiggs's surrender was one of the earliest major moments of the secession crisis. It happened before the guns fired at Fort Sumter. It showed how fast Federal authority could collapse across the South, and it handed Confederate Texas a large supply of military property just as the war began.

The site also ties two big chapters of 19th-century America into one place. In the 1840s, the Army worked from here to wage a war that would add vast western territories to the United States. In 1861, the same site saw the Union lose its grip on the region in the opening days of the conflict over slavery and union. Expansion and division, the two great forces of the era, both passed through this spot.

The marker itself places the site within a much longer tradition, from Spanish colonial days through the Alamo and into the 20th century. San Antonio's identity as a military city is not a footnote. It runs through the whole story of how the United States took shape in the Southwest.

🧭If you visit

You're in the heart of historic San Antonio, so this marker is easy to fold into a walking day downtown. The original stone building is not what you'll be looking at. What you can do is stand where one of the Civil War's first big surprises took place, in the middle of a city that still wears its history openly.

Try to picture the scene in February 1861: armed volunteers in the streets, uneasy Army officers, crowds wondering whether shots would be fired, and in the end a surrender with paperwork instead of bloodshed. It's a dramatic moment that is often left out of the usual Civil War story.

The marker points you toward a bigger itinerary. San Antonio's military story stretches from the Spanish missions to the Alamo to the Army posts that shaped the 20th-century city. Use this stop as one link in that chain and let the layers build on each other as you explore.