* Break off a branch from a tree. This is called stick. Hit someone with it.
* Produce a straight staff from a tree. File down the point of one end, or attach a flint or metal pointy traingle to one end. This is called a spear. In close quarters you may stab someone with it in a jabbing motion. At a distance, you may throw it. Be warned, if you missed you just armed your opponent with a spear.
* Produce a straight staff from a tree and fashion into a bow. Use the sniwes from an animal you slayed using your club or spear and fashion a string you can use on your bow. Produce minature spears that you can use to shoot from this bow. Bows make excellent weapons to be used at a distance before your opponent can get into throwing range of a spear or melee distance if they have a club.
As you can see, Trees are very dangerous and can be used as weapons. We should cut them all down.