From the start, many Texans sought a large part of northern Mexico, including much of New Mexico up to the Rio Grande. In addition, Texans wanted to establish a trade route to Santa Fe. 300 Texans led an expedition to New Mexico to achieve their goals.
However, Governor Armijo of New Mexico heard about the expedition and was suspicious. Sources told him the Texans wanted to conquer New Mexico and take control of trade. So, Armijo organized a small basic army to stop the Texans.
By the time the Texans reached New Mexico, they were exhausted, hungry, thirsty, and lost. They did not realize how long and dangerous the journey across the Llano Estacado would be. They met a force of Mexican soldiers and surrendered.
Armijo forced the captured Texans on a death march down El Camino Real. Those who survived were imprisoned in Mexico. The rest of them would have died.
From then on, there was always a bitter relationship between New Mexicans and Texans.