Viking Outpost.

It is a viking outpost which serves as protection for vikings while also serving as a fast travel for vikings. Which is why you if you are on the good team you may want to destroy it as soon as possible or else vikings will keep on come through the outpost.

In order to destroy the viking outpost, you must place bombs on the side of the walls at the front gate. Be sure the front gate is closed, because it will not deal damage to the outpost if it is open.