The Spanish conquest of Mexico was marked by military superiority and strategic alliances. Cortés and his men leveraged cavalry, firearms, and naval power to overwhelm Aztec forces. These advantages, combined with indigenous alliances, proved crucial in the siege of Tenochtitlan.

The fall of the Aztec capital in 1521 was the culmination of a grueling campaign. Spanish tactics, including psychological warfare and exploitation of rivalries, were bolstered by the devastating impact of Old World diseases on the indigenous population, facilitating their conquest.

Spanish Military Advantages

Cavalry and Firepower

• Horses provided Spanish conquistadors with superior mobility and shock value in battle
• Cavalry units allowed rapid flanking maneuvers and charges against Mesoamerican infantry
• Firearms, including arquebuses and matchlock muskets, outranged traditional Aztec weapons
• Cannons devastated Aztec fortifications and demoralized enemy troops with their thunderous noise
• Spanish steel swords and armor offered significant protection against obsidian-edged Aztec weapons

Naval Superiority

• Brigantines served as mobile artillery platforms on Lake Texcoco
• Spanish ships controlled waterways, cutting off Tenochtitlan's supply lines
• Naval forces provided logistical support for transporting troops and supplies
• Brigantines enabled amphibious assaults on Tenochtitlan's causeways and island sections
• Spanish naval technology surpassed Aztec canoes in both firepower and maneuverability

Siege and Fall of Tenochtitlan

Initial Assault and Retreat

• Cortés launched the siege of Tenochtitlan in May 1521
• Spanish forces and indigenous allies surrounded the Aztec capital
• La Noche Triste occurred on June 30, 1520, marking a temporary Spanish defeat
• Cortés and his men suffered heavy losses during their nighttime escape from Tenochtitlan
• Spanish regrouped and gained more indigenous allies after La Noche Triste

Final Conquest

• Fall of Tenochtitlan took place on August 13, 1521
• Spanish forces systematically destroyed Tenochtitlan's infrastructure during the siege
• Cortés employed a strategy of gradual advance and consolidation
• Aztec defenders faced severe food and water shortages as the siege progressed
• Capture of Cuauhtémoc, the last Aztec emperor, marked the end of organized Aztec resistance

Tactics and Challenges

Strategic Alliances and Psychological Warfare

• Divide and conquer tactics exploited existing rivalries among Mesoamerican peoples
• Spanish formed crucial alliances with Tlaxcalans and other groups opposed to Aztec rule
• Cortés leveraged religious beliefs and prophecies to manipulate perceptions of Spanish power
• Malinche, Cortés' interpreter and advisor, played a key role in diplomatic negotiations
• Spanish used displays of technological superiority to intimidate potential opponents

Disease and Demographic Impact

• Smallpox epidemic devastated Aztec population, starting in 1520
• Indigenous peoples lacked immunity to Old World diseases brought by the Spanish
• Epidemic weakened Aztec military capabilities and disrupted social structures
• Psychological impact of the disease outbreak contributed to Aztec demoralization
• Population decline due to disease facilitated Spanish control over conquered territories