Yesterday whilst casting a few figures I had a little brain blast and decided I needed to have a couple of Nile River forts for our upcoming Sudan Campaign. So in between spins of the moulds I quickly put together two little forts to help defend the Nile from those pesky infidel steam boats. Both forts are opened at the rear as TVAG has mentioned in Vol II of the The Mahdist Wars Source Book. Mine are a little low have no rifle loops but I think for our scale of gaming they will fit in quite nicely.
This image I found on the Internet and was my inspiration for the fort shown below. It was quite big and well above man height. But for wargaming I think it would have taken up half our table. So I reduced it to the scale below.