Showing The Dragon at the Edge of the World. by Charles White
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Two Viking brothers, lost in the New World. One loses his ship to the Mohawks in a dice game. The ship, perfect for riverine warfare, becomes a superweapon on the Lake Champlain/St. Lawrence/Great Lakes waterways. Meanwhile, Chinese pirates are wandering across Canada on the Mackenzie River. They have the secret of gunpowder, which will upset the balance of power between the tribes