Subsequently, Troop D was increasingly harrassed and violence was threatened against them on Nov. 20, 1899. Presuming an assault on the garrison that evening, Post Commander 2d Lt. E. H. Rubottom ordered extra guards and scouts as gunfire erupted between residents and soldiers. When the gunfire exchange escalated, Rubottom ordered a Gatling gun to be shot to quell the violence, resulting in one minor injury.

Official federal and state investigations and proceedings failed to assign culpability to the citizens of Rio Grande City, and unsurprisingly, the Starr County grand jury found the soldiers acted without provocation and the US Army stated Rubottom had acted unwisely.]]> La Matanza, or The Massacre, refers to a period of sustained violence against ethnic Mexicans in Texas amid the Mexican Revolution (1910–1920). Mexicanos and Tejanos were systematically targeted and denied due process by the U.S. Army, Texas Rangers, and other vigilante groups in response to the so-called Bandit Wars along the U.S.-Mexico Border.

Tensions reached their peak following the Plan de San Diego (1915), giving rise to a period of lynchings and massacres known as the Hora de Sangre. It is impossible to know how the number of victims, as people were disappeared, murders went undocumented, neighbors informed on one another, and families fled South to Mexico. However, the killing of at least 300 Mexican-Americans are documented during La Mantanza.

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Following the murders, Capt. Ransom would not allow the bodies to be removed for a proper funeral. In October, Bazan and Longoria were buried by their families where they lay, which is now the Bazan Ranch Cemetery (or Campo de las Flores) in Hidalgo County.

Frank Cushman Pierce reported the incident to the US Secretary of State stating, "Jesus Basan [sic] brother-in-law [sic] of Antonio Longoria, killed near Del Fina or Delfina, Hidalgo County. Antonio Longoria near Delfina Hidalgo County between Delfina and Guadalupe."]]>