In June 1912 Siegmund Lubin placed Fielding in charge of the Lubin Southwest Company as director, despite the fact that until then he had only acted. It was the start of a rapid rise to fame. Fielding would write and direct films as well as star in them. He broke with convention, challenging stereotypical casting of Indians and Mexicans as villains. His films often ended unexpectedly on a downbeat note. His work was praised in the trade press for its visual beauty combined with realism.
Fielding directed films in the old streets of Tucson in 1912, then moved north to Prescott to film stories based on old west mining and Indian life. He used many local people as extras. Towards the end of 1912 he moved his company down to Nogales. In March 1913 he crossed into Mexico with his company, and was able to film the Battle of Nogales as it happened. He later directed and filmed additional battle scenes, then spliced the real and artificial footage to give the sense of the battle having been filmed from both sides. From there he took his company to Silver City, New Mexico, where he rented two houses and built an outdoor stage for shooting interior scenes. He made use of abandoned structures to film spectacular fires or explosions, which formed the highlights of his fresh and realistic films, typically dark human tragedies.