Due to the geographical and hydrological characteristics of the Portuguese Guinea, it was in this theater of operations that the Navy could give a proportionately higher contribution to the Portuguese war effort. Guinea is crossed by a multitude of water streams, many of them navigable rivers, and a large part of its territory is marshy and flooded. This conditions allowed the Portuguese Navy to intervene in virtually all the territory, including in its hinterland regions. By the other side, in this theater, the Portuguese forces faced the PAIGC, probably the best organized, trained and equipped of the independence movements, that from a certain point, managed to obtain a combat potential often equivalent or even superior to that of the Portuguese, which led to the conflict take on many characteristics of a conventional and no longer a mere guerrilla warfare.