 The main defensive structure is a revetted lunette shaped earthwork . It has a 15 @-@ metre ( 49 ft ) thick rampart with 1 @.@ 5 m ( 5 ft ) of concrete and 0 @.@ 6 m ( 2 ft ) of brick forming a retaining wall for the earth fill . The rampart is covered by natural vegetation and , in both the 19th and 21st century operation , is closed to access to preserve this . The glacis gives extra protection to the fort and was designed to blend the fort into the landscape . It surrounded the fort on the north , south and seaward sides and was made by forming the surrounding sandhills . The side facing the fort — the scarp — is steep and , with the front face of the rampart , forms a 12 ft ( 3 @.@ 7 m ) wide ditch that can be raked by rifle fire from the caponier or the stockade 's sides . The outer face is a gentle slope and is designed to be covered by case shot fired from the fort 's 64 @-@ pounder guns . The southern glacis section was removed during sand mining and construction of the caravan park , both after World War II . The western glacis is changed , but still visible , and the northern glacis was recreated in 1993 — showcasing the purpose of the glacis and the function of the caponier . Access to the fort is via double gates at the fort 's rear , one each through the stockade and the rear defence wall . Both gates were removed or destroyed over time and the 21st century gates are reconstructions . The formal parade ground or manning parade lies between the rear walls and barracks , and the raised terreplein . It was formerly used for drill training , assembly and formal parades . First gravelled when constructed , it was paved with tar in the 1890s to solve drainage problems . Around the seaward side of the manning parade runs the terreplein . It is a raised crescent shaped level on which the guns platforms sit , and is ascended from the manning parade by ramps and stairs . 
 The main defensive structure <a href='drop_aux' title='1'><mark>is</mark></a>a revetted lunette shaped earthwork . It <a href='got' title='2'><mark>has</mark></a> a 15 @-@ metre ( 49 ft ) thick rampart with 1 @.@ 5 m ( 5 ft ) of concrete and 0 @.@ 6 m ( 2 ft ) of brick forming a retaining wall for the earth fill . The rampart is covered by natural vegetation and , in both the 19th and 21st century operation , is closed to access to preserve this . The glacis <a href='uninflect' title='3'><mark>gives</mark></a> extra protection to the fort and was designed to blend the fort into the landscape . It surrounded the fort on the north , south and seaward sides and was made by forming the surrounding sandhills . The side facing the fort — the scarp — <a href='drop_aux' title='4'><mark>is</mark></a>steep and , with the front face of the rampart , <a href='uninflect' title='5'><mark>forms</mark></a> a 12 ft ( 3 @.@ 7 m ) wide ditch <a href='null_relcl' title='6'><mark>that</mark></a>can be raked by rifle fire from the caponier or the stockade <a href='null_genetive' title='7'><mark>'s</mark></a>sides . The outer face <a href='drop_aux' title='8'><mark>is</mark></a>a gentle slope and is designed to be covered by case shot fired from the fort <a href='null_genetive' title='9'><mark>'s</mark></a>64 @-@ pounder guns . The southern glacis section was removed during sand mining and construction of the caravan park , both after World War II . The western glacis is changed , but still visible , and the northern glacis was recreated in 1993 — showcasing the purpose of the glacis and the function of the caponier . Access to the fort is via double gates at the fort <a href='null_genetive' title='10'><mark>'s</mark></a>rear , one each through the stockade and the rear defence wall . Both gates <a href='uninflect' title='11'><mark>were</mark></a> removed or destroyed over time and the 21st century gates <a href='drop_aux' title='12'><mark>are</mark></a>reconstructions . The formal parade ground or manning parade lies between the rear walls and barracks , and the raised terreplein . It was formerly used for drill training , assembly and formal parades . First gravelled when constructed , it was paved with tar in the 1890s to solve drainage problems . Around the seaward side of the manning parade <a href='uninflect' title='13'><mark>runs</mark></a> the terreplein . It <a href='drop_aux' title='14'><mark>is</mark></a>a raised crescent shaped level on which the guns platforms sit , and is ascended from the manning parade by ramps and stairs . 
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