Replace the content of the rule “Sieging” with:

As a Labour Action, a Baron may Battle. To Battle, a Baron chooses a Besieged Keep. If the Baron is Hostile to that Keep, he may Activate any subset of the Engines in that Keep using Migrants in his Levy in the same location as those Engines. If the Baron is not Hostile to that keep, he also chooses a Slot in that Keep where he has a Levy member and Skirmishes there. If the total Power of the Baron’s Levy in that slot combined with (if it’s a different Levy) the Levy of the Keep’s owner in that Slot (collectively, the Skirmishers for that Battle) is greater than the total Resilience of the hostile Migrants there, then any of those Hostile Migrants whose Sneakiness is less than the total Smarts of the Skirmishers are expelled to the Inner Slums.