Destiny of Eagles — William W. Johnstone

Falcon MacCallister's father was a legend in the West, but Falcon's quest for justice has driven him onto the wild side of the law. Famed as a gunslinger, feared for his lethal speed and accuracy, Falcon decides to make it a fair fight when he comes up on a man being attacked by a bandit gang in the Dakota Territory. The man is Teddy Roosevelt, the Rough Rider himself.