tkbuffalo wrote:If i buy a lock for my gate, will that help?
You should've locked your gates the first chance you had. If your gates aren't locked the thief will simply walk in and take everything as if you had no wall!
A thief is very easy to raise, it's a throw away alt with 50 black bile and 10 humors on everything else! But to destroy a wall you need further investment
Go for stone hedge wall because even if it's not that strong if someone wants to take down your settlement they have to raise an alt with nearly 100 phlegm (have not tested) And it will take them like an hour to break in. And if you also have Tochposts or braziers shooting at them when trying to destroy your walls most people will walk away, spam them if possible.
As of now your best bet is to track down their settlement, take a screenshot of it and call for help in HoB, but don't post the screenshot or the thief might see it and run away.
Look for the revenge skill in the wiki if you have access to his leanto
Pay 500 silver and put him in the stocks a few times, he might perma die from madness or disease if you spam him there