User blog comment:D2r/Unanswered Questions of Redwall/@comment-1399757-20110213144312/@comment-1399757-20110213151134

Hmmm, I see... That could just be rumor though, as the crew does need to upkeep the slaves' conditions if they want to get where they're going. [conspiratorial I know, lol]

As for sieges. Over the walls if possible, they could also build latrines.