Warriors of the Forgotten Way by Nathan Wagner
In the spring of 1870, Cade Wilson is one of three orphans of the American Civil War that meet a samurai warrior from Japan in the northern New Mexico Territory. This warrior trains these young men in the samurai way––in their weapons of war and the code they live by.
As honor-bound servants to their Benefactor, these samurai cowboys combine their deadly new skills with the way of the West (the gun) to ruthlessly increase and defend their master’s landholdings. And taking control of the territory before the expansion of the railroad is going according to plan … when Cade decides he wants out.