1914 Mexican Revolution: Pancho Villa takes Zacatecas from Victoriano Huerta.
1916 Pancho Villa leads nearly 500 Mexican raiders in an attack against Columbus, New Mexico.
1916 President Woodrow Wilson sends 12,000 United States troops over the U.S.-Mexico border to pursue Pancho Villa.
1916 The 7th and 10th US cavalry regiments under John J. Pershing cross the US-Mexico border to join the hunt for Pancho Villa.
1916 Eight American planes take off in pursuit of Pancho Villa, the first United States air-combat mission in history.