 The fort is designed as a defensible battery , rather than a defensive strongpoint . The faces of the fort join to form a half @-@ moon shape or lunette . The guns ' primary role was to defend Port Adelaide and the Semaphore anchorage rather than the fort itself , and the design reflects this . It was intended to be supported by field artillery , cavalry and infantry for self @-@ defence and to repel landings . While the fort retains its original form , the ditch and glacis ( embankment ) have been modified and are largely non @-@ existent in some areas . Ground levels have been changed to accommodate paths and a caravan park , and the original western fence no longer exists . 
 The fort is designed as a defensible battery , rather than a defensive strongpoint . The faces of the fort join to form a half @-@ moon shape or lunette . The guns <a href='null_genetive' title='1'><mark>'</mark></a>primary role was to defend Port Adelaide and the Semaphore anchorage rather than the fort itself , and the design <a href='uninflect' title='2'><mark>reflects</mark></a> this . It was intended to be supported by field artillery , cavalry and infantry for self @-@ defence and to repel landings . While the fort <a href='uninflect' title='3'><mark>retains</mark></a> its original form , the ditch and glacis ( embankment ) <a href='been_done' title='4'><mark>have</mark></a> been modified and <a href='drop_aux' title='5'><mark>are</mark></a>largely non @-@ existent in some areas . Ground levels <a href='been_done' title='6'><mark>have</mark></a> been changed to accommodate paths and a caravan park , and the original western fence no longer <a href='uninflect' title='7'><mark>exists</mark></a> . 
Da fort is designed as a defensible battery , rather den a defensive strongpoint . The faces of the fort join to form a half @-@ moon shape or lunette . The guns  primary role was to defend Port Adelaide and tdaSemaphore anchorage rather than the fort itself , and the design reflect dis . It was intended to b supported by field artillery , cavalry and infantry fa self @-@ defence and to repel landings . While the fort retain its original form , the ditch and glacis ( embankment ) done been modified and largely non @-@ existent in some areas . Ground levels done been changed to accommodate paths and a caravan park , and the original western fence no longer exist .