He became First Sea Lord and Chief of Naval Staff in December that year and, in that role, persuaded the British Government to fund the replacement of ships lost in the Falklands War.

[3] He attended the Joint Service Defence College in 1966,[1] after which he became second-in-command of the aircraft carrier HMS Hermes.

[11] He conducted the campaign, which ended in the surrender of Argentine forces in June 1982,[12] from the Northwood Command Centre.

[10] He was advanced to Knight Grand Cross of the Order of the Bath in the 1982 Birthday Honours[13] and appointed a Knight Grand Cross of the Order of the British Empire on 11 October 1982 "in recognition of service within the operations in the South Atlantic".

[14] Fieldhouse became First Sea Lord and Chief of Naval Staff on 1 December 1982:[15] in that role he persuaded the British Government to fund the replacement of ships lost in the Falklands War.

[18][19] In retirement he became a consultant to Vosper Thornycroft plc[20] and his interests included sailing.

[1] In 1992 he had a major heart operation in Southampton General Hospital, subsequent to which he caught an infection and died there on 17 February 1992 at the age of 64.