The Apaches were not their only victims. As the Comanches streamed south across the Arkansas River, flush with their astonishing mastery of the horse and their rapidly evolving understanding of mounted warfare, they discovered something else about themselves: Their war parties could navigate enormous distances using only natural landmarks. They could also do it at night. They were better at this, too, than anyone else. Before leaving, a war party would assemble and receive navigational instruction from elders, which included drawing maps in the sand showing hills, valleys, water holes, rivers.
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