The Angolan military launched Operation Restore, a massive offensive, in September 1999, recapturing N'harea, Mungo and Andulo and Bailundo, the site of Savimbi's headquarters just one year before. The UN Security Council passed Resolution 1268 on 15 October, instructing United Nations Secretary General Kofi Annan to update the Security Council to the situation in Angola every three months. Dos Santos offered an amnesty to UNITA militants on 11 November. By December, Chief of Staff General João de Matos said the Angolan Armed Forces had destroyed 80% of UNITA's militant wing and captured 15,000 tons of military equipment. Following the dissolution of the coalition government, Savimbi retreated to his historical base in Moxico and prepared for battle. In order to isolate UNITA, the government forced civilians in countryside areas subject to UNITA influence to relocate to major cities. The strategy was successful isolating in UNITA but had adverse humanitarian consequences.