They can...
BRB Scoring Units
He even provides that in his first posting, still some guys want to ignore it.Scoring Units
Any unit can be a scoring unit, unless:
• It is a Swooping Flying Monstrous Creature, a Zooming Flyer or is a unit currently embarked on a Zooming Flyer.
• It has a special rule specifying that it never counts as a scoring unit.
• It is currently Falling Back (if the unit Regroups it immediately reverts to being a scoring unit again).
• It is a building or fortification that is unclaimed (claimed buildings count as a scoring unit from the claiming player’s army).