Fort Campbell is located on the Selmun peninsula, roughly halfway between Mistra Battery and the ruins of Għajn Ħadid Tower, and facing St Paul's Islands.

[4] The fort was modified throughout the course of World War II, when barracks were built and a radar was installed.

Due to the new threat of aerial warfare, the fort was surrounded by a thin wall, and the buildings were placed at a distance from each other.

In addition, a number of concrete machine gun posts (similar to pillboxes) and rifle loopholes were placed at irregular intervals around the perimeter wall.

The fort also had direction posts, a water tank, underground magazines, a generator room and rock-hewn bomb shelters.

[7] The mayor of the Mellieħa Local Council, Robert Cutajar, is attempting to restore the fort.

In 2014, Prime Minister Joseph Muscat stated that the government intends to rehabilitate the fort and the surrounding area.