[Saxon]

I found that Miasma or Burden of Time or both together really disturb Ulm. Well, they disturb everyone, but when Ulm invaded and I had to keep falling back into my own dominion, their big units got weaker and weaker. Their armies soon lost all the fodder, but the big units kept coming. Then they got very sick.

I cut them off then and hit them with my pretender with fear causing items. They broke fairly quickly, especially as many had battle fright. When they fled and had no where to run to, they died. Seeing twelve cave drakes which had been trashing my provincial defense disappear that way was encouraging.

Curse also helped, I had the shield that throws a curse each turn. That set them up for more afflictions in battle. It seems those strong and long Lasting units can be worn down this way. Also investigate fear. Does Man have access to Terror on the Nature magic side of things?

And yes, another vote for crossbows!