This will make your army Advance to enemy, ranged units will Advance until they can fire, meele units will advance into meele. No enemy leader (Bandits, Looters, Caravans). If sometimes you don't want to manage your army and just want to F O I G H T, then here:
So here's a super tiny guide from what I've gathered. I've seen a lot of new people like me being confused about battle commands, why is Ranged charging into meele, why is Infantry letting itself be pierced by arrows, etc.