Because the rapidly expanding Inca Empire was internally weak, the conquest was remarkably easy. After the Inca Huayna Capac died in 1527, his sons Huascar and Atahualpa fought a civil war over the succession. Although Atahualpa defeated his brother, he had not yet consolidated his power when the Spaniards arrived in 1532, and he seriously misjudged their strength. Atahualpa did not attempt to defeat Pizarro when he arrived on the coast in 1532 because the Incan ruler was convinced that those who commanded the mountains also controlled the coast. When Pizarro formed alliances with Indians who resented Inca rule, Atahualpa did not modify the Inca ceremonial approach to warfare, which included launching attacks by the light of the full moon. On November 16, 1532, Pizarro took Atahualpa prisoner during their first encounter and later executed him, even after payment of a ransom equivalent to half a century of European production of gold and silver. One year later, Cuzco fell.