10. The Flower War was fought by smaller armies with one of their motives being to take sacrificial captives. Agreed upon battle by the different tribe leaders to engage in ritual battles that would provide the different tribes with enough sacrificial victims to appease the gods.
15. Conquistador: Armor / Weapons Tlaxcalteca Leaders were very impressed with the weapons and armor, horses and dogs and decided to form an alliance with the Spaniards.
37. Grindstones Production of grains required grinding for flour. So grindstones become indispensable, including traditional hand grinders and wheeled European millstones.