The Fort is the general area around the Old English fort that stands on top of the Tunnel on your way into Montagu.
The Boer and the Brit (21) - walk down to the wall next to the river (the base occasionally gets covered by water, but you can normally traverse in and avoid getting yourself and your rope wet). The route is 40m long and you belay from the top and walk down. This route is best climbed in early morning to avoid the wind.
The Wall of Confusion Area Walk through the tunnel to the other side - the crag is on your left.