"Begorrah," exclaimed Mike, "I don't like this fun at all, at all!  See, there are two mustangs without anything on their backs!  Small blame to us if we just get astride them."  And suiting the action to the word, he leaped on to one of the ponies, while I mounted the other.  Whether they belonged to any of the Indians, we could not tell, but there were several spare animals besides.