Quote Originally Posted by Quickening
Okay. And once you have a point of Chivalry you are immune to evil effects thereafter?
Not exactly. You can't gain any battledread points if you have a point of battlechivalry, however, you can lose battlechivalry if you rout or don't fight with your general and withdraws.

Note that it only protects against battledread, you can still get evil traits like strategydread if you recruit an assassin, for example.