In 1842, Texans staged a punitive expedition down to the Rio Grande, in retaliation for a Mexican incursion into San Antonio. Things went badly. Very badly.
Further reading:
Soldiers of Misfortune: The Somerville and Mier Expeditions, by Sam W. Haynes
Intro music: Dead Man Walking, Justin LaPoint, Uppbeat
https://www.patreon.com/frontierpartisans
Music: Blue Frontier by Jim Cornelius
Graphics by Lynn Woodward, Woodward Creative