This is another reason to check out LiF. It is a full looting game, and even your land claims can be challenged and lost. Nothing is protected by the system completely. By completely I mean there are ways to take anything. It just may be expensive. You have to collect a ton of resources for example to put a "siege totem" down next to an enemy base. If they lose the battle, you destroy their base. Again, people have a huge incentive to be peaceful. War has severe consequences for individuals and groups alike.