Siege of Cusco

Manco Inca had been installed as a compliant ruler and spent three years watching the Spanish loot his capital before he slipped out of it in April 1536 and raised the highlands. By May an Inca army held the hills around Cusco and the few hundred Spaniards inside watched the thatch of the city they were trying to hold burn over their heads. The fighting turned on Sacsayhuaman, the terraced complex on the ridge above the city, which the Inca had seized and which the Spanish retook in a costly assault that killed Francisco Pizarro's brother Juan. The siege dragged on for months afterward but never again came so close. Manco withdrew into the forested country at Vilcabamba and founded a rump Inca state that survived there until 1572.

Everything known about the siege comes from Spanish accounts or from mestizo writers working decades later, above all Titu Cusi, Manco's own son, dictating in 1570, and Garcilaso de la Vega, writing in Spain from childhood memory and family testimony, so the Inca side reaches us filtered twice. Older narratives treated 1536 as a doomed last gasp; current scholarship reads it as a genuinely close-run campaign that failed for reasons of logistics, seasonal labour obligations and Andean factionalism rather than technological inevitability. The neo-Inca state at Vilcabamba, which the siege produced, is now studied as a functioning polity rather than a postscript. Sacsayhuaman's surviving megalithic walls are both the best evidence of Inca construction and a reminder of what colonial quarrying removed, and the site now hosts the Inti Raymi festival each June.