Portuguese Empire Portuguese personnel established logging infrastructure in an area now referred to as the "Portuguese Fireplace". Throughout 1917 Portugal dispatched contingents of troops to the Allied front in France. Midway in the year, Portugal suffered its first World War I casualty. In Portuguese Africa, Portugal and the British fought numerous battles against the Germans in both Mozambique and Angola. Later in the year, U-boats entered Portuguese waters again and once more attacked Madeira, sinking multiple Portuguese ships. Through the beginning of 1918, Portugal continued to fight along the Allied front against Germany, including participation in the infamous Battle of La Lys.
Portuguese Colonial War though the Portuguese managed to destroy several PAIGC ships and free hundreds of Portuguese prisoners of war (POWs) at several large POW camps. One immediate result of "Operation Green Sea" was an escalation in the conflict, with countries such as Algeria and Nigeria now offering support to the PAIGC as well as the Soviet Union, which sent warships to the region (known by NATO as the "West Africa Patrol") in a show of force calculated to deter future Portuguese amphibious attacks on the territory of the Guinea-Conakry. The United Nations passed several resolutions condemning cross-border attacks of the Portuguese military