The Aztecs began making incursions in the Guerrero area as early as 1414 under Chimalpopoca as part of the conquest of the Toluca Valley. Incursions into the Tierra Caliente came around 1433 under Itzcoatl who attacked the Cuitlatecos settled between the Teloloapan and Cocula Rivers. By 1440, the Aztec Empire controlled the north of the state, or the mountainous areas. Attempts to take the Costa Chica area began in 1452 against the Yopis, which failed. Various battles would be fought between 1452 and 1511 before most of the rest of the state became Aztec tributary provinces. The modern state of Guerrero the comprised seven Aztec provinces.
