Installed during WW1 the Fort's guns were not used for defence. They had a secondary role, backing up the examination vessels that checked the identities of all traffic into the port. If a vessel did not stop for examination, the Fort's guns were authorised to firing warning shots across their bows.
I only spotted this low profile building fairly recently. I assume that it is a fortification as the openings are angled like the Carnot wall at Shoreham Old Fort, along the coast.
You can see a view of the Shoreham fortifications at www.ipernity.com/doc/philsutters/26418683
From Harbour Heights to East Blatchington - 14.11.…
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