Mass Combat - engaged, reserves, etc
Is there a in game reason why Heavily Engaged is such an easy roll at only 10? Shouldn't heavily engaged be the opposite because it's so hard to keep your wits about you while also trying to influence the battle?

The role for Heavilly Engaged is not to direct the battle, it is to see of a Heroic Opportunity arrises. It is far easier to be able to get one in HE then any of the others.