This started as a conversation with the Great Khan Melissa Walshe about how Central Asian horse nomads like the Mongols had a big advantage over city-dwelling people (hint: the answer is “horses.”) Melissa isn’t a horse nomad, but she does raise chickens and she doesn’t like cities. What would give her people a Mongol type advantage in war?
“Tax man’s at the gate again, Paw.”
“Better set loose the terror birds.”
So what do you think would happen if someone had domesticated Phorusrhacos? They’re big, they’re mean, but they can be depended upon to imprint on their masters and defend their territory.