The AI seems a bit schizophrenic to me.

At one point in a battle I was playing with it, it lined up all of its line infantry to meet my main force advancing on its flank and started marching forward to attack me en masse.

Then suddenly it changed its mind and drew back all but three units, two of which stopped and one more of which advanced on me.

I felt kind of insulted, to be honest. It's like the AI wanted me to know it was going easy on me

Psychological warfare, maybe?