Espadarte was second of the s built in the United Kingdom for Portugal in the 1930s. She was in commission in the Portuguese Navy from 1935 to 1950. She was the second Portuguese Navy vessel to bear the name.

Design

Construction and commissioning By the late 1920s, the Portuguese Navy had decommissioned its first submarine, the first , and its remaining submarine force — the 1st Submarine Squadron, which consisted of the three aging vessels of the Foca class — was in such poor material condition that its submarines no longer could operate except in protected coastal waters under controlled conditions. To replace the 1st Submarine Squadron and address the obsolescence and decreasing operability of its submarine force, the Portuguese Navy's 1930 naval program — designed by Minister of the Navy Contra-almirante (Counter Admiral) Luís Magalhães Correia — included three new submarines of the Delfim class.

Vickers-Armstrongs laid down Espadarte on 1933 at its shipyard at Barrow-in-Furness, England, in the United Kingdom. She was launched on 1934 and was commissioned on 1935.

Service history The Portuguese Navy commissioned the new aviso in England on 1935, and Espadarte and Afonso de Albuquerque departed Gravesend in company for their delivery voyage from the United Kingdom to Portugal. When they arrived off Portugal on 1935, twenty-two ships met them off Cascais and escorted them up the Tagus and into port at Lisbon while airplanes and seaplanes flew over them. In a festive atmosphere, the new vessels received an enthusiastic greeting from the crowd in the Praça do Comércio, commonly called the Terreiro do Paço. Espadarte moored at the submarine base at the Belém Dock in the Belém district of Lisbon.

Espadarte′s sister ship had arrived in January 1935, and the third Delfim-class submarine, , soon arrived in Portugal from the United Kingdom as well. They formed the 2nd Submarine Squadron, replacing the 1st Submarine Squadron, whose three Foca-class submarines were retired in late 1934 and 1935 and scrapped. In June 1935, the Portuguese Navy's Naval Training Division conducted maneuvers in the Azores and in the Madeira Islands that involved all three Delfim-class submarines and the destroyers , , and . In 1936, Espadarte made a cruise to the coast of northern Portugal.

All three Delfim-class submarines were in port at Lisbon on 1936 when a mutiny occurred among sailors aboard Afonso de Albuquerque and Dão who wished to steam their ships to a port in Spain and offer them to the Republican faction for use in the ongoing Spanish Civil War. Minister of the Navy Manuel Ortins de Bettencourt ordered the coastal fortifications at Lisbon and the warships at the base to prevent the two ships from leaving port, and the ships came under heavy fire when the mutineers attempted to reach the open sea. Espadarte and Golfinho received orders to prepare to torpedo the two ships if necessary. An unidentified Delfim-class submarine opened fire on Afonso de Albuquerque with a machine gun, and some of the bullets passed near the British ocean liner , which had hundreds of British tourists aboard, but no one was injured aboard Strathmore. Neither of the mutinous Portuguese warships succeeded in leaving port, and the mutiny was put down without the submarines firing any torpedoes.

Espadarte visited the new Lisbon Naval Base, also referred to as the "Alfeite Naval Base," for the first time on 1939. In 1940, she left the Belém Dock and the Lisbon Naval Base became her new base.

World War II began with the German invasion of Poland on 1 September 1939. Portugal maintained its neutrality during the war. This limited Delfim, Espadarte, and Golfinho to conducting exercises off the Portuguese coast until the end of the war in Europe in May 1945.

Off Setúbal, Espadarte made her last dive on 1948. On 1949, she docked at the submarine base at Lisbon with great difficulty because of several material failures that prevented her from submerging.

All three Delfim-class submarines were decommissioned at Lisbon on 1950. Delfim was stricken from the navy list on 1954 and subsequently was scrapped. She had spent 3,770 hours (157 days 2 hours) underway while in service.

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