English: Original description "The 3" high-angle gun that guards the gate ship of the estuary boom defence. Spikes and anti-boats baulks are seen behind."
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Short title
BOOM DEFENCE. 1940, THAMES ESTUARY BOOM DEFENCE, DEFENDING THE PORT OF LONDON, THE NAVAL HARBOURS OF CHATHAM AND SHEERNESS. HEAVY TIDES IN THE ESTUARY AS WELL AS CONSTANT AIR ATTACKS NECESSITATE FREQUENT CHECK UPS ON THE CONDITION OF THE BOOM DEFENCES.