I do not know much about Director Frederick de Cordova but his oversight of COLUMN SOUTH failed to impress me: pedestrian cinematography, plot with a McGuffin (a letter from the fort commander apparently meant to remove the US forces from the fort and allow Navajo Indians to take over... uh?!) and a cast of then unknowns like Dennis Weaver as Menguito, the Navajo leader, and a rather plain-faced Joan Evans.
Thankfully, Audie Murphy saves the film with yet another spirited performance: while kissing Evans, he hears a snake (sounded like a rattlesnake but turned out to be some black reptile that looked suspiciously rubbery), kills it with with a handbag (!), out of which drops the McGuffin letter given by the fort commander. Murphy then has an inkling that that letter might carry dangerous tidings but he does not hesitate to risk court martial by opening and reading it, thereby confirming his worst suspicions.
At that point Murphy's resourcefulness emerges as he goes into the fort's arms depot tunnel, attaches fuses to dynamite and proceeds to blow the occupying Indians to bits - he really puts his shoulder to the wheel and thinks faster than anyone else!
Once the dust settled on the happy ending, I wondered whether I'll remember this film for any length of time (doubt it). 6/10.