[1] The Surrender Chambers in Fort Siloso reopened in June 2017 with a refreshed exhibition and free admission.

Based on the report by Major Edward Lake of the British Royal Engineers, a fort was decided to be built on Pulau Blakang Mati (Sentosa) in 1874 to protect Keppel Harbour.

As part of the planned fortifications, Mount Siloso's top was blown off to flatten it for the installation of coastal-artillery gun platforms.

[2] The fort's guns were fired at encroaching Japanese positions and troops who were pushing towards the city-area northwest from Tengah Airfield.

The British and local troops who were retreating from the overrun Pasir Laba Battery (in Singapore's northwest) and heading back to friendly British lines via the sea were mistaken for Japanese troops and fired upon, with at least major casualties sustained.

During the Konfrontasi period between Sukarno's Indonesia and the Malaysian Federation from 1963 to 1965, Fort Siloso was manned by the 10th Gurkha Rifles to prevent Indonesian military-trained saboteurs from landing on Sentosa and Keppel Harbour slightly inland.