What event could possibly have been the cause of Spanish troops conquering the Inca capital of Cuzco?

The Spanish conquest of the Inca capital of Cuzco in 1533 was largely driven by the Spanish expedition led by Francisco Pizarro, who capitalized on the internal strife within the Inca Empire. The recent civil war between rival Inca leaders Atahualpa and Huáscar weakened the empire, making it more vulnerable to external attacks. Additionally, the arrival of Spanish troops, armed with superior technology and weaponry, and the strategic use of alliances with discontented indigenous groups further facilitated the conquest.