Basil became a commander of Redwall, and fought against Cluny. He showed up just in time for lunch. Basil consoled Matthias when Methusaleh the gatekeeper was murdered by Chickenhound. Basil then was instrumental in the downfall of Asmodeus because he told Matthias how to find him. Basil was captured by Cluny and the horde when Cluny conquered. Basil bravely insulted Cluny by saying he was an insolent barbarian, and Cluny stung Basil with a club. Basil joined in the fight when Matthias arrived, slaying many rats, and lived to the end of the battle.
In the sequel Mattimeo, Basil was back, as less of a freedom fighter and more of a gluttonous adventurer. Basil was drugged by Chickenhound under his Slagar guise, but Basil awoke later to a scene of destruction. He joined the commanders in seeking the captured young ones and liberating Malkariss' kingdom. Then he returned to Redwall with Mattimeo and Matthias and lived on as an adventurer.