You ignored cohesion, which already does much of what you want, and battle is one - but not the only way - to raise that.
Also, courage really doesn't make much of a difference in a medieval style battle. Actually, in most wars up to today. I think we have a good number of soldiers here who can post their own experiences from actual combat. For all I know, when the !@#$ hits the fan, courage doesn't matter. You fight or you die, it's that simple.
