Its that silver and gold chevronned units. I think it was a way to make the Mongols more of a challenge. The only reason you were able to do something against them was because you PREPARED for them. You expected their arrival. I'm not sure much of Europe truly expected the Mongols (and Genghis really was a friggin military genius, or so I've heard).
Anyway as the HRE, why didn't you have quite a few Pavise Crossbowmen in your armies? Those crossbows CAN puncture them with its armor piercing bonus.
That's why I just gave up Kiev when I played as Hungary. I pulled back to the river crossings and just kept killing them at the river crossings (as they were bound to do). Eventually they only have a few armies left and just Kiev
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