Another factor was the ability of the conquistadors to manipulate the political situation between indigenous peoples and make alliances against larger empires. To beat the Inca civilization, they supported one side of a civil war. The Spanish overthrew the Aztec civilization by allying with natives who had been subjugated by more powerful neighbouring tribes and kingdoms. These tactics had been used by the Spanish, for example, in the Granada War, the conquest of the Canary Islands and conquest of Navarre. Throughout the conquest, the indigenous people greatly outnumbered the conquistadors; the conquistador troops never exceeded 2% of the native population. The army with which Hernán Cortés besieged Tenochtitlan was composed of 200,000 soldiers, of which fewer than 1% were Spaniards.