The Inca Civil War (1529-1532)
The war of succession between brothers Huáscar and Atahualpa that fractured the Inca Empire at its peak, killed an emperor, and left the largest state in the Americas exhausted on the eve of Pizarro's arrival.
Events
The Death of Huayna Capac
Emperor Huayna Capac and his designated heir Ninan Cuyochic died in an epidemic — most likely smallpox, which had spread south from Mesoamerica ahead of any European arrival in the Andes. The Sapa Inca left no clear successor. The resulting vacuum split the royal family between his sons Huáscar, based in the capital Cusco, and Atahualpa, commanding the seasoned northern army in Quito.
Location: Quito, Inca Empire (present-day Ecuador)
War Breaks Out Between the Brothers
Negotiations over the division of the empire collapsed into open warfare between the Cusco-based forces of Huáscar and the northern army loyal to Atahualpa. Huáscar's initial offensives under generals Atoc and Hango drove Atahualpa's forces back. The conflict mobilized armies numbering in the hundreds of thousands across the empire's four quarters.
Location: Andes, Inca Empire
Atahualpa's Counteroffensive
Atahualpa's generals Quizquiz and Chalcuchima reversed the war's course in a series of battles that ended with Huáscar's capture. Huáscar's generals Atoc and Hango were killed and, by several accounts, their remains sent to the defeated emperor as taunts. By April 1532 Atahualpa had won the war and was marching south toward Cusco to claim the throne.
Location: Andes, Inca Empire
Huáscar's Execution and the Empire at Its Weakest
As Atahualpa advanced south, he ordered his captured brother Huáscar killed — eliminating the last rival claimant. The war had left the empire politically and militarily drained, with entire armies dead and loyalty divided between the factions. Estimates of the death toll from the war itself exceed 100,000 fighters and civilians.
Location: Andes, Inca Empire
Pizarro Arrives
Francisco Pizarro's expedition of roughly 170 men reached the Andes to find the empire freshly emerged from civil war. Atahualpa, en route to Cusco, received the Spaniards at Cajamarca. The timing — an empire divided between Huáscar loyalists and Atahualpa's northern veterans, both hostile to each other — enabled the conquest that followed. Within months, Atahualpa himself was captured and executed by the newcomers.
Location: Cajamarca, Inca Empire (present-day Peru)