The Guinea-Bissau War of Independence, also known as the Bissau-Guinean War of Independence, was an armed independence conflict that took place in Portuguese Guinea from 1963 to 1974. It was fought between Portugal and the African Party for the Independence of Guinea and Cape Verde, an armed independence movement backed by the Soviet Union, China, Cuba, Algeria and Guinea. The war is commonly referred to as "Portugal's Vietnam" because it was a protracted guerrilla war which had extremely high costs in men and material and which created significant internal political turmoil in Portugal.