The Mier Expedition

🏛️The era

In the early 1840s, the Republic of Texas and Mexico were still at odds. Mexico had never recognized Texas independence, and the land between the Nueces River and the Rio Grande was disputed. In 1842 Mexican forces twice raided and briefly held San Antonio, and many angry Texans wanted to strike back.

Texas organized a retaliatory force that marched toward the Rio Grande late in 1842. When its commander ordered the men home, a large group refused and decided to cross into Mexico on their own. This marker in Roma, on the Rio Grande, marks where that group camped on December 21, 1842, just before the invasion.

The border region was rough, thinly settled country, and both sides tended to answer one violent act with another. That cycle helps explain what happened to the expedition and why its memory still stirred strong feelings years later.

👥People & events

A few days after camping here, the Texans crossed the river and attacked the Mexican town of Mier. After hard fighting, the much larger Mexican force made them surrender. The prisoners were marched south, deep into Mexico.

At Salado, on the long march, the prisoners rose up and escaped. Few got far. Lost and starving in the mountainous desert, most were soon recaptured. As punishment, General Antonio López de Santa Anna ordered that some of them die.

The method was a cruel lottery. The men drew beans from a jar: a white bean meant life in prison and a black bean meant death. On March 25, 1843, seventeen men who drew black beans were shot. Survivors later told of men reaching into the jar, some quiet and some joking bitterly to the end. The rest were held in Mexican prisons until they were released or escaped over the following months.

The story is often told only as Texan heroism and Mexican cruelty, but it is more complicated. The men were an unauthorized armed force invading Mexico, outside the control of their own government. The executions were real and terrible, and both of these things belong in the story.

🇺🇸Its place in the American story

The Black Bean Episode became one of the most bitterly remembered events between Texas and Mexico. Retold again and again, it deepened anger toward Mexico in the years leading up to the U.S. annexation of Texas in 1845 and the Mexican-American War that started the next year.

When U.S. troops marched into Mexico in 1846, some Texans who fought alongside them remembered Mier and the black beans. The episode was part of the long, violent border conflict that ended with the United States taking the Southwest, which changed the map of North America.

The expedition also shows how hard it was for the young Republic of Texas to control its own people. Volunteers acting on their own pulled the republic into a disaster, a common problem on American frontiers, where private raids and revenge often got ahead of official policy.

🧭If you visit

Roma sits on bluffs above the Rio Grande, across the river from Mexico. The town of Mier, where the Texans fought, is just a few miles away on the Mexican side. Standing here, you can picture the camp in December 1842 and how close the men were to the fight they had chosen.

Roma's historic district is worth exploring in its own right. Its old brick and stone buildings reflect the border's mixed Mexican and Texan heritage and give the town a character unlike most of Texas.

The marker fits naturally into a Rio Grande Valley road trip along the river. If the story stays with you, the Mier men are remembered elsewhere in Texas too, including Monument Hill near La Grange, where the remains of the executed men were later reburied.