I was thinking about commanding armies, and I think a few small changes could be made to improve the ordering system:
The ability to order armies back to the barracks, while in transite to a bastion, this is possible, if you catch the army as they enter the targeted area, but you need to time it before they engage the indicated bastion.
Also I think the ability to order armies engaged in combat, but not in the forefront (taking the damage) To retreat back to the barracks would be useful, or to be able to order the armies to attack a new threat, such as forces being sent to relieve the bastion, or to move on to a new bastion when one army is sufficent to see to the taking of the first bastion
Its not very big changes, but it saves time alot for characters leading armies that might happen to make a mistake, and I also believe it gives a bit more options when leading armies.