I read about this strategy in an article and have been testing it out on different tribes in PTW at monarch difficulty small maps. What a blast? Tech for wheel first and settle near horses ASAP. Tech horseback riding then beeline to monarchy. Build horsemen and occasionally settlers. I like getting about 5 or 6 good cities going before really beginning the conquest. I try to focus attacks on AI Capitols and cities with higher population. Settle peace for techs and quickly move to the next AI. Capture workers and build roads from high production core cities to the rapidly changing fronts. Iroqois are good for this strategy, but Mongols are even better. You'll own most of the world by the time the AI gets pikes. And by then you have knights.