Operation Green Sea

Operation Green Sea
Portuguese invasion of Guinea, 1970
Part of Guinea-Bissau War of Independence
Operation Green Sea is located in Guinea
Operation Green Sea (Guinea)
Date22 November 1970
LocationConakry, Guinea

Portuguese victory

Guinea Guinean dissidents
Flag of PAIGC.svg PAIGC
Commanders and leaders
PortugalAlpoim Calvão
PortugalAntónio de Spínola
Portugal Rebordão de Brito
Guinea Sekou Toure
Guinea Commandant Siaka Touré
Guinea General Lansana Diané Surrendered
Flag of PAIGC.svg Amílcar Cabral
Units involved

Portugal Forças Armadas

220 soldiers
200 dissidents
3 patrol boats
2 landing craft
Casualties and losses
1 soldier killed
7 dissidents killed
52-500 killed
26 Portuguese prisoners freed
5 supply ships destroyed
numerous military/government buildings destroyed

Operation Green Sea (Portuguese: Operação Mar Verde) was an amphibious attack on Conakry, the capital of Guinea, by between 350 and 420 Portuguese soldiers and Portuguese-led Guinean fighters in November 1970.[1] The goals of the operation included the overthrow of Ahmed Sékou Touré's government, capture of the leader of the African Party for the Independence of Guinea and Cape Verde (PAIGC), Amílcar Cabral, destruction of the naval and air assets of the PAIGC and its Guinean supporters, and the rescue of Portuguese POWs held in Conakry.

The attackers withdrew after rescuing the POWs and destroying some PAIGC ships and Guinean Air Force infrastructure, but failed to capture Amílcar Cabral, the leader of PAIGC guerrillas, or to topple the regime of Guinean leader Ahmed Sékou Touré.


In 1952, Ahmed Sékou Touré became the leader of the Guinean Democratic Party (PDG). In 1957, Guinea had an election in which the PDG won 56 of 60 seats. The PDG conducted a plebiscite in September 1958 by which Guineans overwhelmingly opted for immediate independence rather than for continued association with France. The French withdrew and, on 2 October 1958, Guinea proclaimed itself a sovereign and independent republic with Touré as its President.

In 1960, Touré welcomed to Guinea and supported Amílcar Cabral and his organization, the PAIGC, which was seeking the independence of Portuguese Guinea (now Guinea-Bissau) and Cape Verde from Portugal.[2] In 1963, the PAIGC began the Guinea-Bissau War of Independence.[3]