What role did the Aztecs believe Huitzilopitchli played in finding a new home?

The Aztecs believed that Huitzilopochtli, their god of sun and war, guided them to find their new home in the Valley of Mexico. They believed that he directed them to settle in the place where they would see an eagle perched on a prickly pear cactus devouring a snake, as seen in their founding myth.