Fort Castle is a location in Remnant that was the site of an important battle during the Faunus Rights Revolution.

The Battle of Fort Castle took place in the third year of the Faunus War and was regarded by historians as the war's turning point.

The leader of the Human forces, General Lagune, sent his army to take the Faunus position at night, attempting to take them by surprise as they slept. However, he failed account for the near-perfect night vision of his adversaries. Lagune's army was soundly defeated, and he himself was captured.