[1] The lines face out across the modern Laguna Estate, which stands on the site of the Inundation, an artificial lake created to obstruct landward access to Gibraltar.

[1] During the construction of the Lines, an "entire human skeleton" was discovered fossilised in the rock but was blown to pieces by a miner.

[4] The Lines saw action during the Thirteenth Siege of Gibraltar (1726–27), when they mounted two cannon and several swivel guns which were reported to have caused heavy casualties among the attacking Spanish force.

During the Anglo-Spanish War of 1761–63, they mounted two 9-pdrs and five 6-pdrs, and by 1770 they could accommodate up to fifty wall-mounted guns using sockets cut into the eastern end of the parapet's crest.

The parapet of the Lines was raised during the war to provide loopholes for rifles, with a second wall added behind and the space roofed over with concrete.