From Wikipedia

Falkland War

The Falklands War (Spanish: Guerra de las Malvinas/Guerra del Atlántico Sur), also called the Falklands Conflict/Crisis, was fought in 1982 between Argentina and the United Kingdom (UK) over the disputed Falkland Islands and South Georgia and the South Sandwich Islands. The Falkland Islands consist of two large and many small islands in the South Atlantic Ocean east of Argentina; their name and sovereignty over them have long been disputed.

The Falklands War started on Friday, 2 April 1982 with the Argentine invasion and occupation of the Falkland Islands and South Georgia, and ended with the Argentine surrender on 14 June 1982. The war lasted 74 days, and resulted in the deaths of 255 British and 649 Argentine soldiers, sailors, and airmen, and three civilian Falklanders.

The conflict was the result of a protracted diplomatic confrontation regarding the sovereignty of the islands. Neither state officially declared war and the fighting was largely limited to the territories under dispute and the South Atlantic. The initial invasion was characterised by Argentina as the re-occupation of its own territory, and by the UK as an invasion of a British overseas territory.