Saturn itself was uninhabitable, but some of its moons did serve as temporary military bases and battlefields. Prior to the accidental discovery of Chaos, most of the Jupiter and Saturn moons served as temporary bases for the Pirate Clan Fleets, since they were where they were originally exiled and later abandoned.
Enceladus, a moon of Saturn known to be one of the only three moons in the Solar System to be astrogeologically active along with Io and Triton. This was the site of the second battle of the Exofleet's hunt to eliminate the Pirate Clans threat just prior to the beginning of the Neosapien War. The moon was heavily fortified and most of the facilities on the planet were underground tunnels, some of which were pressurized with breathable atmosphere.
Tethys, a moon of Saturn heavily mined before the "Golden Age of the Mankind". The Homeworlds used prison labor to mine it so extensively that by the time of the Second Neosapien Revolt, Tethys appeared tortured and irregular in shape. Prisoners were promised freedom after their terms of service on Tethys, but after the opening on the mines on Mars at the beginning of the Golden Age, both the moon and its prison work force were abandoned. These transported prisoners eventually became the Pirate Clans of Saturn, and Tethys became their primary base of operation before the discovery of Chaos.