I just realized that it's actually wiser NOT to promote a unit whenever you could do so, particularly for those newly recruited from barracks. Unlike upgrading, the unit will not lose any movement after promotion in the same turn. So unless you got ambushed, its generally helpful to promote your unit with a most appropriate skill after having figured out whom you are dealing with in the next turn(s).
It's also good to have some unpromoted units around only because they look cool.
One exception should be the injured units because they are partially healed when promoted, and they are usually right in the frontier.
It's also good to have some unpromoted units around only because they look cool.
One exception should be the injured units because they are partially healed when promoted, and they are usually right in the frontier.
