In her book "Statecraft", Margaret Thatcher claims that General Pinochet gave Britain "vital" support during the war, most notably in intelligence, which saved British lives. Thatcher claims that the Chilean Air Force often provided Britain with early warning of impending Argentine Air Force attacks. When, at one point, the Chilean long-range radar was switched off for 24 hours for maintenance work, the Argentinian Air Force was able to bomb the Royal Navy ships "Sir Galahad" and "Sir Tristram", causing many casualties. The "Chilean Connection" is described in detail by Sir Lawrence Freedman in his book "The Official History of the Falklands Campaign".