The army of Teotihuacan introduced body armor, until then unknown in the Americas.
It was made of quilted cotton, many layers thick and capable of stopping most weapons.
Cotton armor was expensive and probably reserved for the best warriors in the front ranks.
The physical protection of the cotton was enhanced by spiritual protections: back-mirrors, feathers, headdresses and Tlaloc goggles.
All this armor enabled them to reduce the size of their shields, making them easier to carry.
Feather curtains were hung at the bottom of these to conceal the actual size and hide the legs from sight.
The army was further enhanced by introducing specialization.
One group was armed with javelins and atlatals.
Slings were also used.
They disrupted the enemy formation.
After this, spearmen and warriors armed with clubs
and maces closed in to finish the job.
However the most important innovation was in recruitment.
Teotihuacan did not only get its warriors from the upper classes, like its rival the Zapotecs, but also enlisted commoners as a seasonal militia force.
All were trained in the standard weapons and tactics.
The numbers and quality of its soldiers gave the state an edge and in the 1st century BCE it started to carve out a small empire.
Its recruitment model allowed it to absorb other peoples, ethnically and culturally different, molding them into the Teotihuacan organization.
The city itself probably reached 150,000 inhabitants around 450 CE.
The expansion did not go on endlessly, as it was limited by logistical constraints.
The demands of trade and tribute on cities in the perimeter of the empire grew and when drought set in, Teotihuacan rapidly declined.
The system collapsed around 550 CE, reducing state and city back to a normal size and reverting the Valley of Mexico to a region of small independent states.
The later Toltecs and Aztecs acknowledged Teotihuacan as their great example, though they certainly did not copy all of Teotihuacans features.
War Matrix - Teotihuacan
Roman Ascent 200 BCE - 120 CE, Armies and troops