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''Catapult Use'':You could put catapults in squares between walls and either have a gate or put a firing account in there when you build it sealing it in. You can then trade ammo and supplies over the wall to the person firing.
==== Types ====
*Wooden Fence
I'd really advise against this type unless you like how it looks in which case use it for fields and containing farm animals. It's easily destroyed so not that useful more cosmetic than practical.
*Stone Wall
This will be you basic defense when you start out easy and fast to make and can take some damage. Try and have two layers of this if you expect it will take a while before you can make tall stone walls.
Allows you to see enemies coming but doesn't stop them from looking in.
*Pallisade Walls
Really costly to make provide some good protection and look really good(imho). Unless you have a lot of trees a size 5 deed will probably be the only practical size to build them or really small bases(camo affect in woods ?)
*Tall Stone Walls
You'll want these for your town. A pain the the ass to take them down(haven't tried catapults). The only problem is you'll need a lot of bricks but for an established town thats nothing. Blocks enemies views of your town but also makes it harder to see them coming. Well worth the hassle you can also make entrances maze like to confuse attackers(add in multiple gates between two layers and it's great fun).
*Gate House
Just a regular one tile house allows you to set access without a deed to make the most out of it have them between two layers of walls. Easy to destroy though so keep them high quality and repaired till you get a deed and can use something better. Also note you'll need everyone on friends list for this option.
*Wooden Fence Gate
I personally don't like these you'll need a gate lock and key for them which without a deed leaves you open to being killed for your key. Although the keyholder can pass straight through you'll need to unlock and lock to let friends in and out. Once you have a deed just chuck the key in a chest or in the bank and let the deed control the gate. With the deed it's so much more easier as you can allow all allies and selected citizens to pass through.
*Pallisade Gates
Although taking up many resources you won't need that many gates.
Don't build these without deed control it's not worth it really. They provide so much extra protection and work perfectly with high stone walls. You'll want these and high stone walls in your finished town (until they come out with something better (metal gates maybe ?).
==== Notes ====
*Without a deed always go for a 1 by 1 gatehouses it saves so much pain or if you have 3 layers of walls have the first two covered by a gatehouse and the third inside one a pallisade gate so you have time to unlock it to let people in and lock it again before the enemy gets in.