That's a great story!
This week the History Channel had a "Wild West Tech" show that dramatized the evolution in firearms technology in the late 1800s, from the Sioux using repeating rifles against Custer to Patton using a Colt peacemaker in 1916 against a bunch of Villa's men. The dramatic recreation of Patton standing his ground, taking dead aim with the Colt and killing two of the Villa guerrillas was stirring. The narrator described it as being more like the gunfight at the OK Corral than a military engagement. Patton had the dead tied to the fenders of his car as you described.
When Pershing saw him rolling into camp, he was shocked but later expressed grudging admiration of Patton after he heard the story of the gun battle. According to the narrator, Pershing thereafter referred to Patton as "My Bandido".