This is B. M. Bower's 1931 novel, "e;Dark Horse - A Story of the Flying U"e;. Big Medicine was a hero among the cowhands of the Flying U after he saved the stranger on horseback who had been struck by lightning. However, their mysterious guest seemed to have amnesia and couldn't remember who he was. A fantastic sequel to "e;Chip of the Flying U"e;, "e;Dark Horse"e; is not t...