Armies moving against each other

[NTJedi]

Tuidjy said:
The manual suggests that when two big armies move against each other, the
larger is somewhat likely to push back the smaller one, and invade the
enemy province. I'm playing Ermor in a test game, and moved four 500+
armies against Ulm. Not once, but four times out of four, my hordes were
pushed back by armies numbering in the twenties.

I can also verify this unfortunate event. It's happened even in a recent MP game where my 100 mercenary troops were pushed back by an army of 15 men.