the time only the minor guerrilla movement, the Frente de Luta pela Independência Nacional da Guiné (FLING), was fighting. By that time, the PAIGC started receiving military support from the Socialist Bloc, mainly from Cuba, a support that would last until the end of the war. In Guinea the Portuguese troops mainly took a defensive position, limiting themselves to keeping the territories they already held. This kind of action was particularly devastating to the Portuguese troops who were constantly attacked by the forces of the PAIGC. They were also demoralised by the steady growth of the influence of the liberation supporters among the population that was being recruited in large numbers by the PAIGC. With some strategic changes by António Spínola in the late 1960s, the Portuguese forces gained momentum and, taking the offensive, became a much more effective force. Between 1968 and 1972, the Portuguese forces took control of the situation and sometimes carried attacks against the PAIGC positions. At this time the Portuguese forces were also adopting subversive means to counter the insurgents, attacking the political structure of the nationalist movement. This strategy culminated in the assassination of Amílcar Cabral in January 1973. Nonetheless, the PAIGC continued to fight back and pushed the Portuguese forces to the limit. This became even more visible after PAIGC received anti-aircraft weapons provided by the Soviets, especially the SA-7 rocket launchers, thus undermining the Portuguese air superiority. Portuguese Mozambique Portuguese Mozambique was the last territory to start the war of liberation. Its nationalist movement was led by the Marxist-Leninist Liberation Front of Mozambique (FRELIMO), which carried out the first attack against Portuguese targets on September 24, 1964, in Chai, province of Cabo Delgado. The fighting later spread to Niassa, Tete at the centre of the country. A report from Battalion No. 558 of the Portuguese army makes references to violent actions, also in Cabo Delgado, on August 21, 1964. On November 16 of the same year, the Portuguese troops suffered their first losses fighting in the north of the country, in the region of Xilama. By this time, the size of the guerrilla movement had substantially increased; this, along with the low numbers of Portuguese troops and colonists, allowed a steady increase in FRELIMO's strength. It quickly started moving south in the direction of Meponda and Mandimba, linking to Tete with the aid of Malawi. Until 1967 the FRELIMO showed less interest