Espíritu de conquista was released in the year 1941。Espíritu de conquista is also called as Western Union, Western Union - Der Überfall der Og, Vildmarkens riddare, Pionniers de la Western Union, He olivat urheita miehiä, Fred il ribelle, Überfall der Ogalalla。

Vance Shaw gives up outlawing and goes to work for the telegraph company; his brother Jack Slade leads outlaws trying to prevent the company connecting the line between Omaha and Salt Lake City. Lots of Indian fighting and gunplay.