Las Navas de Tolosa (Moorish Empire in Spain).
Fought July 10, 1212, between a huge army of Moors, said by the chroniclers to have amounted to 600,000, under Mohammed al Nasin, and the allied armies of the Kings of Castile, Leon, Aragon, Navarre, and Portugal. The Moors were utterly routed, very few of their enormous host escaping from the field.