> Writing gave a huge advantage to the Western forces. By that I mean military men had access to a couple thousand years of military tactics books. Having advanced weapons is one thing, knowing strategy and tactics is quite another.
If memory serves me correctly, military tactics didn't really become a genre until the late 16th century, after the Spanish conquest of the Aztec and Inca empires. And during the early 16th century, it's quite likely that most of the soldiers (including the commanders!) would have been illiterate and thus not really able to read any extant military tactics books, especially whatever survived of Greek or Roman military texts.
If memory serves me correctly, military tactics didn't really become a genre until the late 16th century, after the Spanish conquest of the Aztec and Inca empires. And during the early 16th century, it's quite likely that most of the soldiers (including the commanders!) would have been illiterate and thus not really able to read any extant military tactics books, especially whatever survived of Greek or Roman military texts.