The Spanish were a tiny fraction of their own fighting forces. Their victory was a political achievement, leveraging deep-seated resentments of subjugated peoples against the Aztec and Inca empires, turning local populations into the primary military asset.

Focused on winning his civil war, Atahualpa fatally misjudged the Spanish. He saw the small group as a potential asset—a source of mercenaries, horses, and superior swords to be captured and repurposed. He never considered them an existential threat to his empire, which sealed his fate.

The Spanish didn't defeat the Inca Empire at its height. They arrived after a smallpox epidemic killed the emperor and a subsequent brutal civil war between his sons shattered the empire. This left the civilization politically fractured and militarily exhausted, making it ripe for conquest by a small force.

Cortés and Pizarro were entrepreneurs who fundraised for their expeditions, recruiting 'compañeros' (colleagues), not 'soldados' (soldiers). These were essentially startups driven by profit, pooling assets for risky ventures. This structure incentivized extreme risk-taking and improvisation, with leaders often defying their original investors.

The Aztecs' and Incas' centralized, hierarchical structure was their greatest vulnerability. By capturing a single leader—the emperor—the Spanish could destabilize or control the entire system. In contrast, dispersed peoples like the Maya required a long, grinding war of attrition to subdue.

Conquistador expeditions were entrepreneurial ventures, not state campaigns. Leaders like Pizarro formed partnerships, raised private funds, and invested in high-risk "island hopping" operations hoping for massive returns. This model privatized both the risk of failure and the rewards of success, mirroring modern venture capital.

The narrative of a small Spanish force conquering a vast empire is misleading. The Spanish heavily relied on indigenous allies, like the puppet emperor Paolo Inca, who provided thousands of warriors. These alliances were decisive in key battles, revealing the conquest was also a native civil war exploited by Europeans.

Francisco Pizarro's invasion of Peru was heavily influenced by the recent success of his cousin, Hernán Cortés, in Mexico. The fall of the Aztecs provided a tangible model for conquest, proving that small bands of conquistadors could topple vast empires. This precedent made it easier for Pizarro to secure funding and royal support.

Pizarro's ambush wasn't an improvisation but a standard Spanish colonial tactic: "theatrical terror." This strategy used a sudden, overwhelming, and performative display of violence to psychologically shatter a numerically superior enemy, a method honed in previous American conquests.