On 2 April 1982, the ruling military junta in Argentina ordered the invasion of the British possessions of the Falkland Islands and South Georgia, triggering the Falklands War. The subsequent crisis was "a defining moment of premiership". At the suggestion of Harold Macmillan and Robert Armstrong, she set up and chaired a small War Cabinet (formally called ODSA, Overseas and Defence committee, South Atlantic) to oversee the conduct of the war, which by 5–6 April had authorised and dispatched a naval task force to retake the islands. Argentina surrendered on 14 June and "Operation Corporate" was hailed a success, notwithstanding the deaths of 255 British servicemen and 3 Falkland Islanders. Argentine fatalities totalled 649, half of them after the nuclear-powered submarine torpedoed and sank the cruiser on 2 May.