Slitherine

Playing on the Leipzig map. Custom Battle - Auto troop placement.
My troops just retreated from Leipzig. No red or yellow losses.
Support troops next to the city.
Any idea why?

I'll be more specific. Custom Battle/Leipzip map/auto troop placement
I have artillery in Leipzig.
They get attacked by 2 infantry units and show no damage.
They also get hit by artillery and still show no damage.
They get attacked by both infantry units again and show no damage.
Then they leave the city and are hit with artillery and all die.

Could it be possible that damage is being inflicted but not showing with the yellow morale and red casualty markers?
That would explain most of my complaints like AI cavalry charging across a river and up a hill and sustaining no damage.
Maybe they are damaged but I just can't see it.