Not sure if this would really work well in the game, but perhaps the Marshal could have a "Formation Builder" that allows him to specify where various unit types should start, what formation they should use, and how they should conduct themselves. If he is successful in "Commanding the Field" the units in his army will conform to his custom formation. Perhaps the Marshal could also save and name a certain number of these custom formations formations for use within his army. Also, it would be cool if the General could build and tweak formations that could then be used by all Marshals under his command. In the end this could result in three kinds of formations, Game Wide Formations, Realm Formations and Army Formations...
