For goodness sake, Bert Glennon--he and Lee Garmes were ahead the curve as cinematographers and still rank among the most consummate of artists in that profession.
That said, SHOW THEM NO MERCY is just on this side of the "old dark house" genre which leaves it in proto-noir limbo. Atmospheric as all get out, for sure, but just shy of the level of alienation and "imponderability" that adds an extra layer of tension and puts us over into "noir."
Glennon is a true legend, as these smattering of credits will confirm:
UNDERWORLD, BLONDE VENUS and THE SCARLET EMPRESS with von Sternberg
THE HURRICANE and STAGECOACH with John Ford
(as noted) DESPERATE JOURNEY with Raoul Walsh
THE RED HOUSE with Delmer Daves
RUTHLESS with Edgar G. Ulmer
RED LIGHT with Roy del Ruth (superb visuals on those last three noirs--Eddie should feature these in a NC focusing on cinematograpers...)
HOUSE OF WAX and CRIME WAVE with Andre de Toth
He also made a number of evocative westerns with Ford and de Toth before being farmed out to TV in the mid-50s.
Additionally, some striking silents that deserve more attention.