 From this point Fort Glanville 's significance declined rapidly . Fort Largs was equipped in 1889 with two 6 inch breech @-@ loading disappearing guns which outranged Glanville 's armament . The decline was also linked to changes in Port Adelaide 's maritime facilities and the consequent northward movement of anchored and berthed vessels . During the 1880s the Port River was deepened enabling large ships to sail up and berth , rather than the former practice of anchoring off @-@ shore . 
 From this point Fort Glanville <a href='null_genetive' title='1'><mark>'s</mark></a>significance declined rapidly . Fort Largs was equipped in 1889 with two 6 inch breech @-@ loading disappearing guns which outranged Glanville <a href='null_genetive' title='2'><mark>'s</mark></a>armament . The decline was also linked to changes in Port Adelaide <a href='null_genetive' title='3'><mark>'s</mark></a>maritime facilities and the consequent northward movement of anchored and berthed vessels . During the 1880s the Port River was deepened enabling large ships to sail up and berth , rather than the former practice of anchoring off @-@ shore . 
From this point Fort Glanville  significance declined rapidly . Fort Largs was equipped in 1889 with two 6 inch breech @-@ loading disappearing guns which outranged Glanville  armament . The decline was also linked to changes in Port Adelaide  maritime facilities and the consequent northward movement of anchored and berthed vessels . During the 1880s the Port River was deepened enabling bigass ships to sail up and berth , rather den the former practice of anchoring offf @-@ shore .