Originally Posted by
NikosMaximilian
The only way I can think of a Roman victory is under very specific conditions.
The Romans would be fighting a defensive battle controlling the high ground, located in some bottleneck location (mountain pass, long bridge on a wide river), with their supply lines secured and the chance of retreating to a nearby walled settlement.
The Mongol army would walk into a strategical error by taking this path and not looking for an alternative route. Which, would not very very Genghis-esque. In their early conquests, the Mongols avoided pitched battles. Not until some generations later, when many of them settled they started fighting in those ways.
The Roman army would have to be very large and made up of their best troops and use combined arms tactics. Two very long first lines composed of slingers, archers, ballistas, scorpions and other artillery would try to bombard the Mongols from distance and take out as many of them as they can, but also taking casualties as they enter into the horse-archers' range. In the flanks, the Roman should place first mercenary horse archers (Sarmatian, Alan, etc), their own Sagittarii, and skirmishing cavalry (such as the mentioned Numidians, Cantabrians, etc.).
If the Mongols get tired of getting showered with missiles and they start moving towards the Romans, retreat the slingers and artillery to the very back, but keep the foot archers in the third line shooting over their own troops. At the same time, keep the ranged cavalry attacking them from the flanks, and only retreat them when the Mongols get close, and then send in the Medium and Heavy Cavalry which was waiting behind. In the very unlikely event of a Mongol headlong charge, then the upper hand goes to the Romans.
If the Mongols don't charge, they only enter in the composite bow range and retreat, then it's a matter of numbers and superior firepower. That's why the Romans should have the high ground, otherwise they get butchered. The other one is wait for the mongol army on the other side of a long bridge (something like 600 metres) and concentrate all the arrows, stones and artillery in that choke point to create confusion and mayhem in the Mongol advance.
Also praying to Mars for a heavy rain which makes the composite bows futile and a really muddy field which would slow the Mongols would help.
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