Wall (Warcraft I)

Walls are structures which are used to create a wall around your town. They can be built in the vicinity of your buildings.

While they are not very tough, Walls can delay enemy units for a few seconds, giving your ranged units more time to vanquish them. They are particularly good when combined with Catapults, which can often score direct hits on the enemies while they're busy knocking down a Wall. They are also useful for stopping Invisible units sneaking into your town.