Why the Inca civil war weakened the empire before the Spanish arrival

The Inca civil war of 1527–1532 between the half-brothers Huáscar and Atahualpa fatally weakened the Inca Empire in the years immediately before the arrival of the Spanish. The war was the proximate cause of the Spanish success: when Francisco Pizarro’s tiny force of about 168 men entered the highlands in 1532, the empire that confronted him was not the powerful state of Huayna Capac’s heyday, but a polity that had been wrecked by five years of internal conflict, a generation of epidemic disease, and a succession crisis that had destroyed the legitimate institutions of imperial government. The Spanish success was not inevitable, but it was made possible by the civil war. The full campaigns of the war are described in the article on Huáscar and Atahualpa, and the dynastic origins are treated in the article on Ninan Cuyochi and the succession crisis.

The Destruction of the Imperial Elite

The most important consequence of the civil war was the destruction of the imperial elite. The Inca state was a personal monarchy in which authority was concentrated in the Sapa Inca and in the royal panacas — the descent groups that held the wealth, the mummies, and the ritual functions of past emperors. The Cusco aristocracy was the heart of this system: it staffed the imperial administration, the state priesthood, the army officer corps, and the provincial governorships. The civil war destroyed most of this class.

The chronicles record that the northern armies of Atahualpa, under the generals Quisquis and Calcuchimac, systematically killed the male members of the Cusco panacas, sacked the imperial capital, and desecrated the mummies of the dead emperors. The royal mummies, which had been venerated as state cults, were stripped of their gold and silver trappings and hidden or destroyed. The principal shrines of the empire, including the Coricancha and the fortress of Sacsayhuamán, were occupied by northern garrisons, and the traditional social order was overturned. The Cusco aristocracy never recovered. When the Spanish arrived in 1532, there was no functioning central administration, no imperial court, and no body of legitimate officials to govern the empire.

The destruction of the imperial elite was not only a question of personnel. It was also a question of legitimacy. The Sapa Inca was understood to be the son of the Sun and the political embodiment of cosmic order. The destruction of the Cusco panacas and the humiliation of the imperial mummies broke the chain of legitimacy on which the imperial cult was based. The result was a profound crisis of political and religious authority that the Spanish were able to exploit by installing their own puppet emperors.

The Exhaustion of the Imperial Armies

The second major consequence of the war was the exhaustion of the imperial armies. The wars of the 1430s through the 1520s had built a sophisticated military system in which a relatively small standing force of veterans was supplemented by large drafts of mit’a conscripts mobilized through the ayllu system. The civil war consumed this system. The veteran troops of Huayna Capac’s northern campaigns, the best soldiers in the empire, were used up in the war, and the conscript armies of the central and southern highlands were bled white by the fighting.

The war also produced a fractured military command structure. The armies of Atahualpa, which had won the war, were led by generals who owed their position to the new emperor and who could not easily be replaced. The army that Atahualpa brought to the Battle of Cajamarca in 1532 was a large force of perhaps 30,000 to 80,000 men, but it was drawn largely from the northern and central highlands, and it was concentrated near the city because Atahualpa was preparing to march on Cusco. The Spanish, by attacking Atahualpa’s retinue while the main army was camped nearby, were able to neutralize a force they could not possibly have defeated in the open field.

The exhaustion of the armies had a longer-term effect. The Spanish conquest of Peru after 1532 was carried out with the help of indigenous auxiliary forces drawn from communities that were hostile to Atahualpa’s regime. The Cusco panacas, the central highland communities, and the peoples of the northern lowlands all contributed troops to the Spanish campaigns. The Spanish success was thus not only a result of the destruction of the Inca armies; it was also a result of the political fragmentation of the empire, which produced large indigenous populations willing to fight against Atahualpa’s successors.

The Demographic and Economic Impact

The civil war was fought on top of a demographic catastrophe. The smallpox epidemic of the 1520s had already killed a large fraction of the Andean population before the war began, and the war itself added a second wave of mortality. The chronicles suggest that tens of thousands of soldiers and civilians were killed in the major battles, in the sieges of provincial centers, and in the punitive campaigns of the northern armies. The destruction of the imperial storage system, the disruption of agricultural labor, and the displacement of mitma communities all contributed to a profound disruption of the economic organization of the empire.

The economic consequences of the war were visible at Cajamarca in November 1532. The Inca state had traditionally maintained a sophisticated system of state hospitality for traveling nobles and officials, and Atahualpa was able to bring to the Spanish ambush a retinue of several thousand attendants and a quantity of goods and treasures that the chroniclers estimated in the tens of thousands of ounces of gold and silver. But the empire’s productive capacity had been severely damaged by the war, and the ability of the state to mobilize resources on the scale of a generation earlier was clearly reduced. The redistributive economy had been built on the assumption of a stable population and a functioning provincial administration; both were now compromised.

The Political Vacuum

The fourth consequence of the civil war was a political vacuum that the Spanish were able to fill. The death of Huayna Capac, the death of Ninan Cuyochi, the destruction of the Cusco aristocracy, and the elimination of Huáscar had left the imperial throne effectively vacant. Atahualpa was the victor of the civil war, but he had not yet been crowned Sapa Inca, and his legitimacy was contested by the surviving members of the Cusco panacas and by a number of his half-brothers.

The Spanish exploited this vacuum ruthlessly. They captured Atahualpa, demanded a ransom of a room full of gold and two of silver, and used the ransom to finance their own campaigns. They executed Atahualpa in 1533 and then installed a succession of puppet emperors — first Túpac Huallpa, a brother of Huáscar; then Manco Inca, another brother; and then Paullu Inca, a son of Huayna Capac who collaborated openly with the Spanish. The Manco Inca rebellion and the foundation of the Neo-Inca State at Vilcabamba of 1535–1537 was the last major attempt to restore an independent Inca state, and it was led by a prince who had himself been installed by the Spanish.

The Strategic Setting for the Spanish Arrival

When Francisco Pizarro entered the highlands in 1532, he found a state that was simultaneously very large and very weak. The empire of Huayna Capac, with its veteran armies, its functioning administration, and its unquestioned legitimacy, would have presented a much more difficult target. The empire of Atahualpa was vulnerable. The civil war of 1527–1532 was the hinge of the entire story of the Spanish conquest of the Inca Empire, and the effects of the war would outlast the conquest: the destruction of the imperial elite and the disruption of the panacas weakened the institutional base of Inca culture, and the subsequent epidemics and Spanish exploitation finished the work. The Quechua language and many Andean cultural practices survived the conquest, but the political and religious institutions of the Inca state did not. The civil war of 1527–1532, in this sense, marks the end of the independent Inca civilization.