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When Sam Cary and his bullwhackers set out on the Bozeman Trail for Fort Greybull, they knew they were riding into danger. Sam's arch-rival Mark Stockwell had been running guns to the Indians, a hot-blooded young warchief was stirring up the tribes and the cavalry had already pulled out. But Sam was a fighter with a lot at stake--including a grey-eyed beauty named Gaybird. Besides, it was already too late to turn back. The first wagons were outside the sallyport when the thundercloud of warriors burst upon the fort ...