BBC World Service - World Update, A war memorial of a different kind This link will take you to a BBC news report on an art installation which remembers the imprisonment of 900 CO's in the fort.
It should be made clear that this relates to WW1, not WW2, the focus of the website.. It should also be made clear that the fort was a military establishment, not a civil prison. Therefore any conscientious objectors there were not serving a sentence of imprisonment. They were held by the Army as resisting notional soldiers, having been forcibly enlisted.