Fort Siloso, located on the northwestern tip of Sentosa Island, was built in the 1880s on Mount Siloso to aid in protecting the port, particularly the western entrance to Keppel Harbour and the coal stocked nearby.
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Fort Siloso was built by the British in 1880s to guard the narrow western entrance to Keppel Harbour. The fort guarded the western approaches to Singapore during World War II. By 1939 it was armed with two 6-inch (150 mm) Mark2 guns and two rapid firing 12-pounder guns.