Pre-1914 Portugal was a troubled country emerging just from a revolution: The partition of the former Portuguese colonial empire in Africa being shared between England and Germany since the Berlin Treaty in 1878, and the alliance with England reactivated with the treaty of Windsor in 1899. The discredited monarchy ended in 1908 with the assassination of Don Carlos I, followed by a violent revolution which led in 1910 to the accession to the throne of the house of Braganza, and Manuel II, with the promise of a parliamentary monarchy. But the new monarchy was soon corrupt and unpopular. The clashes were violent between Socialist Republicans and Royalists, and the Navy played its role in particular during the bombing of Lisbon. The crews were overwhelmingly in favor of the republic. The latter was proclaimed on October 5, 1910.
Coastal Battleship Vasco Da Gama
Republicans being a little more concerned with the well-being of the people than the ancient monarchy of past glories, the ambitious naval program of 1890 was abandoned. Moreover, the civil war had emptied the state coffers. The plan of 1907, relatively modest, but still providing 2 battleships and 6 cruisers, was not approved for lack of funds. But soon the ambition to recover colonial territories in the face of the pretensions of Germany in particular made approve a new large-scale plan in 1912: Three dreadnought battleships of the Minas Gerais type, 3 cruisers, and light buildings. It was reduced in 1913 to 2 cruisers, 6 destroyers and 3 submersibles, built mostly in Great Britain. The war made them requisition. Also it is with forces relatively obsolete for the essential that Portugal went to war:
1 Coastal Battleships: The Vasco da Gama (1875).
4 Cruisers: Adamastor, Sao Gabriel, Dom Carlos I and Rainha Dona Amelia (1896-99).
3 Destroyers: 2 class Guadina (1911 – 2 others under construction in Lisbon), Tejo (1901). The Liz ordered in Italy, was requisitioned by the English and became the HMS Arno.
4 Torpedo Boats: No. 1 to 4 (1881-86).
1 submersible: Espadarte (1912).
24 Miscellaneous: Avisos Rainha de Portugal (1875) and Alfonso d’Albuquerque (1884), 2 gunboats class Rio Lima (1875), 2 class Lurio (1907), 2 Class Beira (1910, 3 others in 1917), Zambese (1886) ), Zaire (1884), Diu (1889), Limpopo (1890), Dom Luiz (1895), Patria (1903), 5 river gunboats class Cacheu (1902), Macau (1909), Flexa (1909). Patrolmen Dili, Lince (1911), aviso and yacht of Admiralty Cinco de Octubre (1900).
Armored Coast Guard: 1 – Cruisers; 4 – Destroyers: 3 – Raiders: 4 – Submersibles: 1 – Various: 24
The Portuguese Navy during the First World War:
In fact, Portugal began to undertake military operations in Africa directed against the Germans and to attack German commercial traffic in the area. The war was an opportunity to recover ancient territories and settlements. But the official declaration of war awaited March 1916. An important Portuguese expeditionary force set out to fight on the northern front at Loos in 1916, but in Africa, the German counter-offensive forced the Mozambique border. At sea a duel of artillery took place between the gunboat Augusto de Castillo escorting a liner and the U139 that commanded the Lothar von Arnaud of the Pierière. The latter was a trawler (Elite) requisitioned in 1917 and armed with a 65 mm gun and a 47 mm. The U139 was a submersible cruiser armed with 2 pieces of 150 mm. The fight for honor led to the destruction of the courageous escort who sank on 14 October 1918. Other buildings were requisitioned, such as the auxiliary cruiser Pedro Nunez, the Sado II minesweeper, and the Açor gunboat. In 1918, the Tete River gunboat Tete was also deployed on the Zambeze.
Cruiser Rainha Dona Amélia
The Portuguese military ports were Lisbon, with large dry docks, foundries and asenaux, but also Luanda in Angola, Lourenço Marques in Mozambique, and Port Delgado in the Azores, equipped with coastal batteries. The latter served as a transit base for US transport to Europe. In exchange for its commitment to the allies, Portugal received from Germany war reparations to the Versailles treaty and a piece of territory in northern Mozambique belonging to the German colony. She also received six ex-Austro-Hungarian torpedo boats and a Turkish gunboat.