| Access is not possible to the east wing vaults, the top of the main tower, basement, caponier and ditch. |
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| This is the view from the north caponier along the curtain wall, made of flint reinforced with brick. |
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| The east and west ditches are enfiladed by small, two storey demi caponiers whilst the main ditch is covered by a full caponier. |
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| The caponier changed its form and grew to great importance in the nineteenth century, as I will explain later. |
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| Fort Nelson was to be armed with four of these guns in the main north caponier and two in each of the demi caponiers. |
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| Flanking chambers built into the inner wall of the ditch provided covering fire across the face of each caponier to prevent the enemy laying charges to destroy them. |
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