I will do my best to explain.
Any kind of war was, naturally, pleasing to our gods. Each warrior, dying, spilled his lifeblood, the most precious offering a human could make. In a punitive war, a decisive victory was the objective, and so both sides fought to kill or be killed. The enemy were, as my old Master put it, weeds to be mowed. Only a comparatively few prisoners were taken and kept for later ceremonial sacrifice. But whether a warrior died on the battlefield or on a temple altar, his was accounted a Flowery Death, honorable to himself and satisfying to the gods. The only problem was—if you look at it from the gods' point of view—that punitive wars were not frequent enough. While they provided much god-nourishing blood and sent many soldiers to be afterworld servants of the gods, such wars were only sporadic. The gods might have to wait and fast and thirst for many years between. That displeased them, and in the year One Rabbit, they let us know it.
That was some twelve years before my birth, but my father remembered it vividly and often told of it with much sad shaking of his head. In that year, the gods sent to this whole plateau the harshest winter ever known. Besides freezing cold and biting winds which untimely killed many infants, sickly elders, our domestic animals, and even the animals of the wild, there was a six-day snowfall which killed every winter crop in the ground. There were mysterious lights visible in the night skies: wavering vertical bands of cold-colored lights, what my father described as "the gods striding ominously about the heavens, nothing of them visible but their mantles woven of white and green and blue heron feathers."
And that was only the beginning. The spring brought not just an end to the cold but a scorching heat; the rainy season ensued, but it brought no rain, the drought killed our crops and animals as dead as the snows had done. Nor was even that the end. The following years were equally merciless in their alternate cold and heat and dearth of rain. In the cold our lakes froze over; in the heat they shrank, they became tepid, they became bitter salt, so that the fish died and floated belly up. and fouled the air with their stench.
Five or six years continued thus: what the older folk of my youth still referred to as the Hard Times. Yya ayya, they must have been terrible times indeed, for our people, our proud and upstanding macehualtin, were reduced to selling themselves into slavery. You see, other nations beyond this plateau, in the southern highlands and in the coastal Hot Lands, they had not been laid waste by the climatic catastrophe. They offered shares of their own still-bounteous harvests for barter, but that was no generosity, for they knew that we had little to trade except ourselves. Those other peoples, especially those inferior to us and inimical to us, were only too pleased to buy "the swaggering Mexíca" for slaves, and to demean us further by paying only cruel and miserly prices.
The standard trade was five hundred ears of maize for a male of working age or four hundred for a female of breeding age. If a family had one sellable child, that boy or girl would be relinquished so the rest of the household might eat. If a family had only infants, the father would sell himself. But for how long could any household subsist on four or five hundred ears of maize? And when those were eaten, who or what remained to be sold? Even if the Good Times were suddenly to come again, how could a family survive without a working father? Anyway, the Good Times did not come—
That was during the reign of the First Motecuzóma and, in attempting to alleviate his people's misery, he depleted both the national and his personal treasury, then emptied all the capital's storehouses and granaries. When the surplus was gone, when everything was gone except the still-grinding Hard Times, Motecuzóma and his Snake Woman convened their Speaking Council of elders, and even called in seers and sayers for advice. I cannot vouch for it, but it is said that the conference went thus:
One hoary sorcerer, who had spent months in studying the thrown bones and consulting sacred books, solemnly reported, "My Lord Speaker, the gods have made us hungry to demonstrate that they are hungry. There has not been a war since our last incursion into Texcala, and that was in the year Nine House. Since then, we have made only sparse blood offerings to the gods. A few prisoners kept in reserve, the occasional lawbreaker, now and then an adolescent or a maiden. The gods are quite plainly demanding more nourishment."
"Another war?" mused Motecuzóma. "Even our hardiest warriors are by now too feeble even to march to an enemy frontier, let alone breach it."
"True, Revered Speaker. But there is a way to arrange a mass sacrifice..."
"Slaughter our people before they starve to death?" Motecuzóma asked sardonically. "They are so gaunt and dried-up that the whole nation probably would not yield a cupful of blood."
"True, Revered Speaker. And in any case, that would be such a mendicant gesture that the gods probably would not accept it. No, Lord Speaker, what is necessary is a war, but a different kind of war...."
That, or so I have been told, and so I believe, was the origin of the Flowery Wars, and this is how the first of them was arranged:
The mightiest and most centrally situated powers in this valley constituted a Triple Alliance: we the Mexíca with our capital on the island of Tenochtítlan, the Acolhua with their capital at Texcóco on the lake's eastern shore, and the Tecpanéca with their capital at Tlácopan on the western shore. There were three lesser peoples to the southeast: the Texcalteca, of whom I have already spoken, with their capital at Texcala; the Huexotin with their capital at Huexotzinco; and the once mighty Tya Nuü—or Mixteca, as we called them—whose domain had shrunken until it consisted of little more than their capital city of Chololan. The first were our enemies, as I have said; the latter two had long ago been made our tribute payers and, like it or not, our occasional allies. All three of those nations, however, like all three of ours in the Alliance, were being devastated by the Hard Times.
After Motecuzóma's conference with his Speaking Council, he conferred also with the rulers of Texcóco and Tlácopan. Those three together drafted and sent a proposal to the three rulers in the cities of Texcala, Chololan, and Huexotzinco. In essence it said something like this:
"Let us all make war that we may all survive. We are diverse peoples, but we suffer the same Hard Times. The wise men say that we have only one hope of enduring: to sate and placate the gods with blood sacrifices. Therefore, we propose that the armies of our three nations meet in combat with the armies of your three nations, on the neutral plain of Acatzinco, safely far to the southeast of all our lands. The fighting will not be for territory, nor for rule, nor for slaughter, nor for plunder, but simply for the taking of prisoners to be granted the Flowery Death. When all participating forces have captured a sufficiency of prisoners for sacrifice to their several gods, this will be mutually made known amongst the commanders and the battle will end forthwith."
That proposal, which you Spaniards say you find incredible, was agreeable to all concerned—including the warriors whom you have called "stupidly suicidal" because they fought for no apparent end except the extremely likely and sudden end to their own lives. Well, tell me, what professional soldier of your own would refuse any excuse for a battle, in preference to humdrum, peacetime garrison duty? At least our warriors had the stimulus of knowing that if they died in combat or on an alien altar, they earned all people's thanks for pleasing the gods, while they earned the gods' gift of life in a blissful afterworld. And, in those Hard Times, when so many died of inglorious starvation, a man had even more reason for preferring to die by the sword or the sacrificial knife.