During the Mexican Revolution of 1910, the U.S. Army established an encampment in Castolon, located in the Big Bend region of Texas, primarily to monitor and manage the effects of the conflict spilling over the border. The revolution, which was a complex and multifaceted civil war in Mexico, had significant cross-border implications, including concerns about security and stability in the border areas of the United States.

The U.S. Army's presence in Castolon was part of a broader effort to protect American interests and citizens, prevent arms smuggling, and maintain order along the border. The encampment served as a strategic point for the military to observe activities across the Rio Grande and respond to any threats or incidents that might arise due to the proximity of the conflict. This military presence was crucial in ensuring that the violence and chaos of the revolution did not escalate into a larger international conflict involving the United States.

Additionally, the encampment played a role in supporting local law enforcement and providing a sense of security to the residents of the border region during a time of significant unrest and uncertainty. The U.S. Army's activities in Castolon and other border areas during this period were part of a larger pattern of military involvement aimed at stabilizing the U.S.-Mexico border during the tumultuous years of the Mexican Revolution.