In April 1982 Haig conducted shuttle diplomacy between the governments of Argentina in Buenos Aires and the United Kingdom in London after Argentina invaded the Falkland Islands. Negotiations broke down and Haig returned to Washington on April 19. The British fleet then entered the war zone. In December 2012 documents released under the United Kingdom's 30 Year Rule disclosed that Haig planned to reveal British classified military information to Argentina in advance of the recapture of South Georgia Island. The information, which contained the United Kingdom's plans for the retaking of the island, was intended to show the Argentine military junta in Buenos Aires that the United States was a neutral player and could be trusted to act impartially during negotiations to end the conflict. However, in 2012 it was revealed via declassified files from the Reagan Presidential Library that Haig attempted to persuade Reagan to side with Argentina.