and amphibious missions in the ocean and inland waters of Angola, Portuguese Guinea and Mozambique. In amphibious missions the action of the Portuguese Marines was fundamental. Two types of Marine units were created, the Special Marines (fuzileiros especiais) specialized in offensive operations and the Marines (fuzileiros) for the defense of naval assets. The Portuguese Navy had to equip itself with a large fleet of small units including patrol boats and landing craft, many of them designed and built in Portugal. In the Angolan theater, the main focus of the Portuguese Navy effort was the protection of the Zaire River, to avoid the infiltration of UPA/FNLA and MPLA guerrillas from the bordering Congo-Léopoldville (later known as Congo-Kinshasa and then Zaire). This mission was done by the patrol and landing crafts of the Zaire Flotilla, occasionally supported by frigates, and by units of Marines using rubber boats. The interdiction of the Zaire River was so successful that the Portuguese was able to stop the infiltration of the guerrillas, allowing the Portuguese Forces to defeat and almost totality eliminate them from Northern Angola, virtually terminating the war in the region in the early 1970s. The defeat and elimination of the guerrillas in Northern Angola, led the independence movements to re-orientate their activity to the vast, remote and almost desert areas of Eastern Angola in the late 1960s, benefiting from support and bases in the neighboring Zambia. To respond to this move, the Navy also started to focus in Eastern Angola, establishing naval and Marine units at more than from the sea coast. These operated in the Zambezi, Cuando, Cuanza and other local rivers, against the MPLA and UNITA guerrillas that were active in the area. In the end of 1968, the Command of the Navy Forces in the East was established in a base located in a region known as the Terras do Fim do Mundo (the Lands of the End of the World), that gave origin to a small town named Vila Nova da Armada (New Town of the Navy). From 1970, the Portuguese naval presence in Angola stabilized, including one frigate in rotation, four patrol ships, 11 patrol motor launches, 15 landing crafts, two Special Marine detachments, four Marine companies and five detachments of the Navy Forces in the East. Due to the geographical and hydrological characteristics of the Portuguese Guinea, it was in this theater of operations that the Navy