Watch Ambush Trail for Free: How to Stream the Movie Online at 123Movies. . One of four western films made for PRC by bantam-weight Bob Steele, Ambush Trail stars Steele as cowpoke Curley Thompson. The villain of the piece intends to bankrupt all the local ranchers and grab up the surrounding property for himself. But with Curley involved, the bad guy and his minions don't have a chance. The screenplay, by D. W. Griffith alumnus Elmer Clifton, is a medley of western cliches, pausing every so often for a first-rate action sequence. Perennial sagebrush sidekick Sid Saylor provides negligible comedy relief.