Patton had his first real taste of battle in 1915 when leading cavalry patrols against Poncho Villa at Fort Bliss along the Mexican border. In 1916 he was selected to aide John J. Pershing, commander of the American Expeditionary Forces in Mexico. In Mexico, Patton impressed Pershing by personally shooting Mexican leader Julio Cardenas during the Battle of Columbus. Pershing promoted Patton to captain and invited him to lead Pershing's Headquarters Troop once they left Mexico. In 1917, during...