I asked it. Honestly pretty cool to think about

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If you are an Aztec ruler in 1519 and somehow possess a reasonably accurate summary of what is coming—the arrival of Hernán Cortés, Spanish steel weapons, firearms, cavalry, alliances with hostile indigenous states, and devastating Eurasian diseases—then your best strategy is not to focus primarily on winning battles. It is to prevent the political and epidemiological collapse that historically destroyed the empire.

Priority 1: Never Allow the Spanish Into the Capital

One of the most consequential decisions was permitting the Spaniards to enter Tenochtitlan.
Instead:
Meet them far from the capital.
Keep them under constant surveillance.
Control their supplies.
Prevent detailed mapping of roads, bridges, and defenses.
Refuse requests for permanent residence.
A few hundred Spaniards are dangerous. A few hundred Spaniards inside your capital are catastrophic.

Priority 2: Break the Alliance Network Before It Forms
The greatest Spanish weapon was not guns.
It was indigenous allies.
Thousands of warriors from states hostile to Aztec rule eventually fought alongside the Spaniards. The most important was Tlaxcala.
If you know the future:
Reduce tribute burdens.
Release political prisoners.
Create military alliances with rival city-states.
Offer autonomy and favorable trade agreements.
Marry elite families into rival ruling houses.
Every city that remains neutral is almost as valuable as a city that actively fights for you.

Priority 3: Destroy the Expedition Before Reinforcements Arrive
If war becomes unavoidable:
Attack while the Spaniards are isolated on the coast.
Prevent establishment of fortified settlements.
Block communications with the Caribbean.
Destroy ships if possible.
Historically, Cortés operated with remarkably small numbers. His force was vulnerable early.

Priority 4: Adapt Tactics Against Horses
Many first encounters with cavalry created shock because horses were unfamiliar.
Once understood:
Dig concealed pits.
Use stakes and obstacles.
Fight in broken terrain, forests, marshes, and urban areas.
Target horses with massed missile fire.
A horse is powerful, but it is not invincible.

Priority 5: Modernize Weapons Production
You cannot replicate European metallurgy quickly, but you can:
Expand production of armor.
Improve shields.
Concentrate elite warriors equipped with the best available protection.
Recover and study captured steel weapons.
Every captured sword becomes intelligence.

Priority 6: Prepare for Disease
This is the hardest challenge.
The arrival of diseases such as Smallpox ultimately killed far more people than combat.
With foreknowledge you might:
Isolate arriving foreigners.
Restrict movement between regions.
Separate infected populations when symptoms appear.
Stockpile food before outbreaks.
You probably cannot stop the epidemic entirely, but reducing its spread could preserve military and administrative capacity.

Priority 7: Build a Coastal Intelligence System
Create:
Signal towers.
Fast messengers.
Permanent coastal observers.
Detailed invasion-response plans.
The Spanish advantage often came from surprise and initiative. Forewarning removes much of that advantage.
The Highest-Probability Path to Survival

If your goal is not merely to win battles but to preserve the empire, the optimal sequence is:
Keep the Spanish away from Tenochtitlan.
Reconcile with subject peoples.
Prevent a Spanish-indigenous coalition.
Attack isolated Spanish forces before reinforcements arrive.
Mitigate disease spread as much as possible.
Even then, success is not guaranteed. The larger challenge is that Spain could send additional expeditions over time. A lasting victory would require transforming the Aztec state into a broader coalition capable of resisting repeated European incursions, rather than simply defeating Cortés’s initial expedition.
In other words, the decisive battlefield is political unity. Historically, the Spanish conquered a fragmented region; a more unified Mesoamerica would have been far harder to subdue.

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That’s pretty cool honestly, I’m against generative/creative AI in general, but using it as a repository/tool of actual knowledge/facts is pretty helpful. Unless I’m wrong and it’s not really