Aztexco's Pool

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 thirsty boiler the Rebel tankers dismount and begin filling their water tank. Their actions disturb the slumber of the pools guardian.  

The story is 2224 words.