FILE -- This picture, taken at the border at Nogales, Ariz., in 1916, shows left to right, Gen. Alvaro Obregon, Gen. Pancho Villa and Gen. John J. Pershing in a friendly meeting. A few months afterward the three generals becames "enemies on the field" as Pershing dashed into Mexico in pursuit of Villa. According to newly discovered documents Villa stole 122 bars of silver from a Wells Fargo train in 1913, then secretly struck a deal to sell most of the loot back to the bank. (AP Photo/File) Copyright 1996 The Arizona Daily Star PLS:Historic; Book:A; People: Pancho Villa, Alvaro Obregon, John J. Pershing