Promising, but...
CAST - 2: On the back cover, this appears: "When Major Frank Paddock and Barnes Kilrone were dashing young officers in Paris, they both fell in love with the same woman." Sounds great! But that's not the story. Betty Considine watches the stranger Kilrone ride into town on the first page, and that IS the story, but we learn so little about Betty (she isn't the Parisian woman, btw). Medicine Dog is half-Sioux. Iron Dave Spoul knows five Indian dialects and wears a 'massive chain of gold nuggets ... draped across the front of his vest.'. We get just a taste of seemingly huge characters. Perhaps these characters are more developed in other L'Amour novels? I'm not sure, but here they are a bit flat. It's as if the author was told, "You get 50,000 words, that's it." (Actual word count is just under 50K, rather short for any novel.)
ATMOSPHERE - 4: Lots of little things here, like the barrels of water that should be at each of the barracks, but aren't. Hog Town, where a man can find anything. A great discussion about how Genghis Khan united all of the Mongol tribes, but apparently Native Americans didn't develop/fight that way, and what if they had? An epic scope is touched upon: how do these ex-Parisians wind up in the middle of the Santa Rosa Mountains. A great, detailed map prefaces the story. L'Amour knows his stuff.
PLOT - 2: You know this standard story, it does need to be fleshed out.
THRILLS - 2: A climax with 'Native Americans in the attic' is...rather silly.
RESOLUTION - 2: Just okay.
SUMMARY - 2.4. I like this author but "Kilrone" felt like a throw-away, meet-a-deadline work. That's too bad because it starts with an epic, globe-trotting feel. And therein lies the rub. Read "Flint" instead.