I've been playing a lot of KAG (King Arthur's Gold) and in a recent video we joined an already in progress team match and I was freaking out over the 1 block wide walls people kept building.
I play mostly as a builder in the game, and I've learned that when the other team has a catapult, you don't waste time building 1 block wide walls. One strategic hit with a rock and the whole wall is gonna come tumbling down... which it did several times.
You can watch the video here: [link]
We will also be having a tournament in the game soon where you can win a premium KAG account, so keep a lookout in my journals for more info.