Angolan government and Cuban troops had control over all southern cities by 1977, but roads in the south faced repeated UNITA attacks. Savimbi expressed his willingness for rapprochement with the MPLA and the formation of a unity, socialist government, but he insisted on Cuban withdrawal first. "The real enemy is Cuban colonialism," Savimbi told reporters, warning, "The Cubans have taken over the country, but sooner or later they will suffer their own Vietnam in Angola." Government and Cuban troops used flame throwers, bulldozers, and planes with napalm to destroy villages in a 1.6 mile wide area along the Angola-Namibia border. Only women and children passed through this area, "Castro Corridor," because government troops had shot all males ten years of age or older to prevent them from joining the UNITA. The napalm killed cattle to feed government troops and to retaliate against UNITA sympathizers. Angolans fled from their homeland; 10,000 going south to Namibia and 16,000 east to Zambia, where they lived in refugee camps. Foreign Secretary Lord Carrington of the United Kingdom expressed similar concerns over British involvement in Rhodesia's Bush War during the Lancaster House negotiations in 1980.