Sentence:  Even with the seat, most <WSD>garderobes</WSD> in castles did not encourage long stays....Despite the unappealing and unsanitary nature of <WSD>garderobe</WSD> shafts, besieging forces on more than one occasion successfully entered castles by having men climb up the shafts. 
Meaning of the word marked with <WSD> tags:  A lavatory, especially in a castle and built into the outer wall, with vent directly over the moat or midden.