Portugal during World War II
Upon the start of World War II in 1939, the Portuguese Government announced on 1 September that the 600-year-old Anglo-Portuguese Alliance remained intact, but that since the British did not seek Portuguese assistance, Portugal was free to remain neutral in the war and would do so. In an aide-mémoire of 5 September 1939, the British Government confirmed the understanding. As Hitler's occupation swept across Europe, neutral Portugal became one of the Continent's last escape routes. Portugal managed to remain neutral throughout the war despite extraordinary pressures from both sides, notably over the strategically located Azores islands and over the wolfram (tungsten) trade.
Military history of Portugal
Portugal remained steadfastly neutral in World War II, but became involved in counterinsurgency campaigns against scattered guerrilla movements in Portuguese Angola, Portuguese Mozambique, and Portuguese Guinea. Except in Portuguese Guinea, where the revolutionary PAIGC quickly conquered most of the country, Portugal was able to easily contain anti-government forces through the imaginative use of light infantry, home defense militia, and air-mobile special operations forces, despite arms embargoes from other European countries. During the counterinsurgency campaigns in Angola and Mozambique, Portugal was significantly aided by intelligence provided by native residents who did not support revolutionary forces. However, the ideology of the guerillas, especially the PAIGC, had a profound impact on the officers of the Portuguese armed forces and a left-wing military coup in Lisbon by Portuguese military officers in 1974 toppled the Caetano government and forced a radical change in government attitudes. Faced with international condemnation of its colonial policies and the increasing cost of administering its colonies, Portugal quickly moved to grant the remainder of its African colonies independence.