As you progress through a specific mission line, that gang’s strongholds are eventually marked on the map for you to take over. Taking over an enemy gang’s stronghold awards you that territory, as well as some cash. Capturing all of a gang’s strongholds is required to unlock the final mission in their respective mission line.
Stilwater Caverns: Black Bottom/Factories District
All you have to do is destroy the six shanties in the homeless area to capture Stilwater Caverns. Follow the cyan marker on the GPS to reach the shanties, and throw a homeless person at each of one to destroy them.
Strongholds for the gangs appear on the following pages...