The Forsaken Hovels are former military buildings that were abandoned at the end of the First Tiberium War, and later discovered and refurbished by the Forsaken. Due to their general lack of resources, the Forsaken are forced to make use of everything they can find, and so these barracks come in various shapes and sizes. One half of the hovel acts as the Forsaken's barracks, accommodating and training their militia. The other half acts as bestiary housing malformed lifeforms that they've managed to bend to their will.
Capturing a Forsaken Hovel will allow you to enlist their mercenaries.