Operation Mailfist was a planned Allied offensive to liberate Singapore from Japanese occupation during World War II.
[1] As Singapore was heavily protected, the forces scheduled to reinforce the British East Indies Fleet in late 1945 included the monitors HMS Abercrombie and Roberts which would have bombarded the island with their powerful guns.
[3] An offensive to re-take northern Malaya, designated Operation Broadsword, was to be conducted at the same time as the advance towards Singapore.
[5] Following the Japanese surrender Operation Zipper was scaled down and brought forward, and was conducted in early September 1945 in order to rapidly liberate Malaya.
[1][6] Instead, it was replaced with Operation Tiderace during which an Allied fleet transported troops directly to Singapore and re-occupied the city in early September without encountering any opposition.