Etzanoa has remained a mystery for 400 years. Archaeologists could not find it. Historians thought reports of a permanent settlement with 20,000 Native Americans in it were exaggerated. Now Donald Blakeslee says he’s found it. The discovery could put south-central Kansas on the map as the second-biggest settlement of Native Americans found in the United States, Blakeslee said. And it’s now, finally, the known location of a 1601 battle pitting outnumbered Spaniards firing cannon into waves of attacking Indian warriors.