Mongols Cant Be Defeated In Real But Yes In Game They Can Be Defeated By Bribing Them.We Have Ruled The World Our Great great fathers Gengis Khan He Concqured Most Of The Land More Land Than Any One Even Alexander.
Last I checked regarding history, the mongols were defeated. There biggest mistake was invading Europe. However if you read history. Most of the european land the mongols invaded was taken without much of a fight because the people of those lands diddn't have the man power to stand up against as many troops the mongols had. Fear was the mongols key to taking a lot of territory without a fight. However the Roman Empire couldn't stand for this and out smarted the mongols in battle. The Romans with additional support from a few various other countries who lent soldiers including those of the land the mongols conquered. There army was defeated.
So generally in real life, yes the mongols can be defeated. In real-life and in-game. While I won't disagree the mongols were smart and a devasting foe. I'll give credit where credit is due. They understood the importance of archer and the ammount of archers they had was there only benefit in war. Most armies could not stand up to that many archers.
However they were not advanced, as smart as they were. The Romans were just superior in many ways. They had superior battle formations which some are known to be the best formations to stand up against archery. Such as the tortoise formation. Also each line of soldiers would fall back to be replaced by the soldiers behind them and move to the back of there formations for a breather. This tactic has worked well for the romans in defeating armies with larger numbers. Keeping there soldiers fresh.
They also had ancient artillery, large spear shooters (forget there name) that can impale several lines of men. They Romans were great for developing war tactics and were the most disiciplened soldiers of that time. Sorry to say but no mongol invasion could ever invade europe and win.