Description from the publisher:

Bull spit and horse feathers! More strange folk have migrated to your neck of the woods, leaving you with little elbow room. To make matters worse, windmills and catapults are popping up like dandelions. That takes the biscuit! You’re not about to lick someone’s boots without a fight.

Feudum: Windmills & Catapults adds new region tiles, royal writs, a wooden windmill, and the ability to play with a 6th, pewter-colored player.