Southsea Castle today - neither the lighthouse, nor the roofed over structure to its right would have been there during the Civil War, but a reasonably sized garrison might well have kept the Parliamentary forces at bay for more than just a day!
(We have been unable to contact the person who owns the rights to this photo, although we know who he is. If that is you, could you please e-mail us and we will remove this picture, if necessary.)