Essentially a much heavier version of the M113 APC, the Battle Fortress was a heavily armored mobile bunker with a machine gun and firing ports for up to five infantry. It was tied with the Kirov Airship for the strongest armor of any unit. The Battle Fortress was so large and heavy that it could easily crush walls and most other vehicles simply by driving over them, including the mighty Apocalypse Tanks. However, due to the Battle Fortress's slow speed, this ability was impractical against a competent enemy commander.