Iceus Is Workin' It

After two weeks of travel, the party arrives near to the city of Arenthia and begin to discuss the siege of Arenthia with Legate Vanellus Iceus. He has his siege all set and already in motion, but he has scout reports of a water source that has been diverted to flow into a cave system underneath the city. His siege would be helped by having some people sneak into the city and divert military attention. The Blackpowder Mercenaries volunteer.