The Nggela Islands group lies immediately north of the more famous island of Guadalcanal, the scene of the Guadalcanal Campaign during World War II; however, Nggela Sule itself was garrisoned by the Japanese in April 1942 in connection with their efforts to establish a seaplane base on neighbouring Gavutu. On 7 August of the same year, the United States 1st Battalion, 2nd Marine Regiment landed on the island to provide cover for the assault on the neighbouring Tulagi islet. Florida Island served as a small, secondary base of operations for the US and Australian and New Zealand war effort in the Pacific for the duration of the war. Following the Allied liberation of the island from the Japanese, it became the site of a US seaplane base. About 80 Japanese troops from Tulagi escaped to Florida Island and fought Marine and British Solomon Islands Protectorate Defence Force patrols for the next two months until being wiped out. The island subsequently served as a watering point for the US Navy, diverting water from an underground source on the island.