Understanding the Conquest Period
The Spanish conquest of what became New Spain is one of those topics that comes up constantly in Latin American history courses. You will find a million summaries online, but most of them skip over the logistical reality of how it actually unfolded. I spent years trying to reconcile the popular narrative with the archival records, and the mismatch is usually where the real story lives. Cortés arrived on the Mexican coast in 1519 with roughly 500 men. That number is important because every decision he made from that point forward was shaped by the fact that he was dramatically outnumbered. He did not defeat the Aztec Empire through superior firepower alone. He won because he understood local politics better than either side expected him to. The Tlaxcalans were the Aztecs' biggest rivals in the region. When Cortés reached their territory, most people assume he fought them and then somehow converted them through sheer charisma. The reality is messier. He fought them for several days, suffered real losses, and then negotiated. The Tlaxcalan leadership calculated that allying with the Spanish was the better bet against their longtime enemies. That calculation held for years. Without Tlaxcalan manpower, which swelled to tens of thousands of indigenous warriors at points during the siege of Tenochtitlan, the Spanish would have been wiped out months earlier.
I ran into a specific problem when trying to verify troop numbers at the Battle of Otumba in 1520. Most secondary sources cite inflated figures. The primary accounts, particularly the letters Cortés wrote to Charles V and the Indigenous codices like the Florentine Code, give contradictory numbers depending on who was writing and why. My workaround was to cross-reference the Spanish correspondence with the Huejotzingo codices and the letters of the Tlaxcalan chroniclers. Where they converged on roughly 1,000 to 2,000 allied indigenous fighters supporting maybe 90 Spanish soldiers, I treated that as the most reliable range. The exact number still cannot be pinned down, but you can narrow it enough to stop citing the worst-guessing textbooks. Smallpox played a role that gets oversimplified in popular retellings. It devastated the Aztec population, yes. But it also hit the Spanish camp harder at times because the disease moved through crowded conditions on both sides. The timing mattered more than the raw death toll. The epidemic hit Tenochtitlan during the siege in 1520 and 1521, disrupting command structure and supply lines for the defenders at exactly the wrong moment. The fall of Tenochtitlan in August 1521 took nearly two years of planning after the initial Spanish entry into the city in 1519. The siege strategy itself was methodical. Cortés ordered the construction of brigantines on Lake Texcoco to control water access. This was not an impulsive move. He had studied Mediterranean naval tactics and adapted them to a freshwater lake environment, which most people do not realize was an unusual engineering feat at that scale in the Americas.
One counter-intuitive point that beginners miss: the conquest was not a continuous campaign. It fragmented into dozens of regional conflicts across Mesoamerica. Even after 1521, Spain faced major uprisings for decades. The pure military phase ended, but political consolidation dragged through the 1540s and beyond. The Mixtón War in the northwest and the Tzutujil resistance in the highlands are examples where the "conquest" narrative breaks down completely. Another thing that is easy to get wrong is the legal framework. The Spanish Crown did not simply authorize everything Cortés did. In fact, they put him on trial afterward for overstepping his authority. The Laws of the Indies and the broader legal apparatus that followed were as much about controlling Spanish actors as they were about managing conquered populations. If you are researching this period, looking only at military history will leave you with an incomplete picture. The bureaucratic records from the Casa de Contratación and the Archivo de Indias contain layers of administrative detail that reshape how you understand the timeline. There is no single source that covers all of this cleanly. The best approach is to read the primary documents alongside modern scholarship that challenges the older narratives. Works by scholars like Hugh Thomas and Matthew Restall provide different angles, and neither should be taken as definitive on its own. The field has shifted significantly in the last twenty years, and older textbooks reflect assumptions that have since been revised.
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