On March 9, 1916, the Mexican revolutionary, Pancho Villa, conducted a raid on the town of Columbus, New Mexico, and in response, President Woodrow Wilson ordered a United States Army expeditionary force commanded by Brigadier Gerneral John J. Pershing to pursue Villa into Mexico. Although Venustiano Carranza, President of the de facto Government of Mexico, privately acquiesced to the pursuit, he demanded the withdrawal of the foreign army after an incident at Parral, a small town deep in Chihuahua. The United States ignored these demands since Villa was still loose. Carranza then informed the United States that if its troops moved in any direction but north his army would resist. In response to this threat, Pershing ordered two troops ...