From Halopedia, the Halo wiki
UNSC Toulouse was a Halcyon-class light cruiser in service with the UNSC Navy. Unlike her sister ship UNSC Pillar of Autumn, the Toulouse was not upgraded with improved engines, weapons, and a smart AI. During the Human-Covenant War, the Toulouse engaged several CCS-class battlecruisers over an unidentified Forerunner installation that was not a Halo ring or an Ark. Severely outnumbered and outgunned, the Toulouse was likely destroyed in this engagement.