the Portuguese overseas provinces in Africa. They were mostly entirely based and supported from outside Portugal's territories. Headquartered and managed in countries like Senegal, Tanzania, Algeria, Guinea and Ethiopia, these guerrilla movements sought weapons, financing and political support in Eastern Bloc's communist states and the People's Republic of China. A Cold War conflict in Portuguese Africa was about to start. Marxist-Leninist and Maoist ideologies, backed by countries like the Soviet Union and People's Republic of China were behind the nationalist guerrilla movements created to attack Portuguese possessions and claim independence. The USA and other countries, in order to counter communist growing influence in the region also started to support some nationalist guerrillas in their fight against Portugal. The series of guerrilla wars involving Portugal and several armed nationalist groups from Africa in its overseas provinces of Angola, Guinea, and Mozambique, become known as the Portuguese Colonial War (Guerra Colonial or Guerra do Ultramar). African nationalism in Portuguese Africa Portuguese Angola In Portuguese Angola, the rebellion of the ZSN was taken up by the União das Populações de Angola (UPA), which changed its name to the National Liberation Front of Angola (FNLA) in 1962. On February 4, 1961, the People's Movement for the Liberation of Angola (MPLA) took credit for the attack on the prison of Luanda, where seven policemen were killed. On March 15, 1961, the UPA, in a tribal attack, started the massacre of white populations and black workers born in other regions of Angola. This region would be retaken by large military operations that, however, would not stop the spread of the guerrilla actions to other regions of Angola, such as Cabinda, the east, the southeast and the central plateaus. Portuguese Guinea In Portuguese Guinea, the Marxist African Party for the Independence of Guinea and Cape Verde (PAIGC) started fighting in January 1963. Its guerrilla fighters attacked the Portuguese headquarters in Tite, located to the south of Bissau, the capital, near the Corubal river . Similar actions quickly spread across the entire colony, requiring a strong response from the Portuguese forces. The war in Guinea placed face to face Amílcar Cabral, the leader of PAIGC, and António de Spínola, the Portuguese general responsible for the local military operations. In 1965 the war spread to the eastern part of the country and in that same year the PAIGC carried out attacks in the north of the country where at