Healed casualties

[seienchin]

WOOW. Okay I researched myself and played 10 custom and 2 campain battles to do so and here are my results:

1. The units who are first getting casualties (Not just contact, not just killing enemies) are getting their soldiers healed.
2. When I atacked with 3 Units and let one of them rout, it had the most people restored.
3. Getting one man killed in the beginning is enough. I got one rider killed and 5 minuits later 30 more and they still got healed.

This blows my mind? Who made that system?
I guess that is the reason why the only efficient tactic in a long campain in EB is to always press forward. When I started to roleplay my battles I took huge losses

There is still something I didnt research:
What about reeinforcement?