 The military encampment on Pulau Sejahat was built around 1937-38, when the threat of war with Japan was becoming very real.It was a full-scale encampment with barracks, bunkers, gun emplacements and high lookout posts.The British assembled pillboxes and gun batteries all along the southern coast of Singapore, from Buona Vista in the west to Pulau Sajahat in the east, with a total of 51 guns.