Aztexco's Pool — Larry Brasington

A squad of Confederates, on patrol in their walking Steam tank,  are forced into a forgotten valley by bandits.  The Rebels discover a strange ancient city hidden in the valley. In the center is a shimmering pool. Needing water for their thristy boiler the Rebel tankers dismount and begin filling their water tank. Their actions distrub the slumber of the pools guardian.  

Story is 2224 words.