On 1 April 1982, alongside the Royal Marines party, the FIDF was mobilised to defend the Islands from the Argentine invasion. Many of its members lived in remote settlements so given the limited notice of its approximately 120 men some 32 turned out. The following day, Sir Rex Hunt ordered them to surrender. The Argentines confiscated all of the FIDF's equipment and declared them to be an illegal organisation. For the duration of the war, some members of the FIDF were kept under house arrest at Fox Bay until the Argentine surrender. The FIDF was reformed in 1983.