Thank you for the feedback! Glad that you liked the game :) I'm preparing a bug-fix update coming soon.
What do you mean "it refuses to attack walls" you mean catapult? Because in SiegeUp! only catapults are capable of attacking walls :)
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ah that would make sense because I didn't have any access to catapults so I was confused how I was suppose to attack so I used archers to attack over the walls.
Edit: While we are in the topic of bug fixing. I did encounter another weird one where the bow of a ship can somehow fire across an entire map or long distances. The ship would lock onto someone and you move the ship and it continue to attack it. I can make a video next time if I encounter it.