An assault isn't resolved in the same manner as a regular combat, as the two units involved are not in base contact with one another. Rather, we assume that a swirling melee takes place around the building's door, windows and other entryways, with the best fighters from either side pushing their way forwards into the fray.

Models assaulting or defending a building lose all charging bonuses. This means, for instance, that they do not receive the normal +1 combat result or Initiative, gain no charge bonuses from weapons (like spears, lances and pikes), and do not make Impact Hits.