648. The Fall of the Incas: Battle for the Sacred City (Part 5)

What It Covers

Part 5 of the Fall of the Incas series covers the 1536 Inca uprising led by Manco against roughly 200 Spanish soldiers in Cusco. The episode traces how Spanish abuse of Manco and his family triggered a coordinated rebellion of approximately 100,000 fighters, the brutal siege of Cusco, and the three-way standoff between Manco, Hernando Pizarro, and Diego de Almagro.

Key Questions Answered

• •Occupier miscalculation: Gonzalo and Juan Pizarro's decision to kidnap Manco's sister and seize his wife while Francisco was absent in Lima directly triggered the 1536 uprising. With only 200 Spaniards holding an empire of 12 million people, abusing the puppet ruler whose cooperation sustained their entire regime was a catastrophic strategic error that nearly ended Spanish rule in Peru entirely.
• •Asymmetric siege warfare: Manco's forces developed a specific counter-technology against Spanish fortifications: sling-launched stones wrapped in cotton and pre-heated in campfires, fired onto thatched rooftops. Combined with winds, this turned Cusco into a city-wide fire. The tactic nearly overwhelmed the garrison before African slaves stationed on rooftops with water buckets contained the spread to two stone buildings.
• •Native alliance dependency: Spanish survival in Cusco depended not on military superiority alone but on continuous support from indigenous groups hostile to Inca rule, including the Canari and Chachapoya peoples, plus several of Manco's own brothers who defected. Without these auxiliaries, fewer than 200 Spaniards could not have held the city against an estimated 100,000 besieging fighters for months.
• •Cavalry terrain limitation: For the first time during the conquest, Manco's forces neutralized Spanish cavalry by concentrating troops so densely that horses could not maneuver. This single tactical adaptation removed the Spaniards' primary battlefield advantage. The lesson: technological superiority is terrain-dependent, and a sufficiently large force can neutralize elite weapons by eliminating the physical space required to deploy them effectively.
• •Organizational capacity as military asset: Manco's ability to secretly mobilize approximately 100,000 fighters, arm them with clubs and slings, and supply them with food before the Spanish detected the operation demonstrated the Inca administrative system's residual power. John Hemming describes this as the last great tribute to Inca organizational genius — a top-down collectivist empire executing one final large-scale mobilization.
• •Factional rivalry as strategic vulnerability: Almagro's return from Chile with 600 Spaniards created a three-way standoff — Hernando Pizarro inside Cusco, Manco's forces outside, and Almagro's army arriving separately. Manco tested Almagro's loyalty by demanding he execute four Spanish scouts; Almagro refused, confirming to Manco that Spanish factions would ultimately unite against him. This realization ended Manco's negotiating options and forced his retreat into the Vilcabamba jungle.