She was named for the archer of the zodiac — Sagittarius — and like the other ships of the Spica class, she carried the name of a constellation. The Italian torpedo boat Sagittario was launched at Fiume in June 1936, a compact warship 82 metres long, built for speed and for convoy escort in the confined waters of the Mediterranean. She was not a capital ship. She would never fight a fleet action. But in the waters around Greece, Crete, and the Ionian Islands during the Second World War, she found herself at the centre of events that cost many lives — and she managed, through the long years of that war, to survive them.
Sagittario was laid down on 14 November 1935 and commissioned into the Italian Royal Navy, the Regia Marina, on 8 October 1936. She was armed with three 100 mm guns, four 450 mm torpedo tubes in twin mounts, two depth-charge throwers, and mine-laying equipment. Within months of commissioning she was at sea during the Spanish Civil War, participating in the Italian naval blockade of the central Mediterranean aimed at Republican and Soviet shipping. When Italy entered the Second World War on 10 June 1940, Sagittario was assigned to the 10th Torpedo Boat Flotilla at La Spezia. That same November, she was on patrol in the Sicilian Straits when she encountered the British Mediterranean Fleet conducting Operation Collar — the resulting engagement became known as the Battle of Cape Spartivento.
The action for which Sagittario is best remembered took place in May 1941, during the German airborne invasion of Crete. On 21 May, she was assigned to escort the 2nd Motor Sailing Flotilla: 38 Greek caiques carrying soldiers of the 2nd Battalion, 85th Mountain Regiment, from the German 5th Mountain Division, bound from Milos toward Heraklion. A previous convoy heading for Maleme had already been intercepted by British cruisers and forced back with heavy losses. When word of those losses reached the 2nd convoy, recall orders were issued, but they did not arrive until the small vessels were already 25 miles off Milos and the British force was withdrawing. Sagittario kept the convoy together and the troop transports escaped undamaged. Her commander, Giuseppe Cigala Fulgosi, was subsequently awarded Italy's Gold Medal of Military Valour for the action. The Battle of Crete resulted in the deaths of thousands of soldiers and sailors on all sides, as well as the deaths of many Cretan civilians. Sagittario's role was to protect the soldiers in her charge; she did so, though the broader campaign carried a terrible cost.
In the early hours of 8 February 1942, a British submarine, HMS Proteus, fired torpedoes at Sagittario without success, in the waters off Lefkada. Sagittario counter-attacked and moved to ram the submarine. Proteus turned toward the torpedo boat to present a smaller target; the submarine's hydroplane struck Sagittario's bow before Proteus broke off. On 26 April 1943, Sagittario was escorting the Italian cargo ship Teramo toward Bizerte when three British Fairmile motor torpedo boats attacked. Sagittario beat off the assault but not without consequence: MTB 639, commanded by Stewart Gould, engaged Sagittario at close range, was set on fire, and had to be scuttled. Gould and six other officers and ratings died in the fight. In the final months of the North African campaign, Sagittario also shot down a B-24 bomber and evacuated Italian troops from Corfu.
Sagittario survived the war intact. In 1949 she was reclassified as a corvette — the middle gun and torpedo launchers were removed, replaced with six 40 mm anti-aircraft cannons and an anti-submarine Hedgehog mortar, reflecting the priorities of the Cold War era. When Italy joined NATO, her pennant number changed to F557. She continued in service until 1 October 1964, when she was decommissioned and scrapped. She had spent 28 years at sea, from the final years of peace through the worst of the Mediterranean war to the early decades of the alliance that followed. The waters around Lefkada, where she once dodged a torpedo in the dark, are quiet now.
The Sagittario's wartime operational area centred on the Ionian Sea and the waters around the Greek islands. Her encounter with HMS Proteus took place off Lefkada, at approximately 38.68°N, 20.50°E. From the air, the island of Lefkada is visible as a distinct mass connected to the Greek mainland by a causeway. The nearest major airport is Aktion National Airport (LGPZ), near Preveza, approximately 15 km to the northeast of Lefkada's northern tip. Viewing altitude of 5,000-8,000 feet gives a broad perspective on the Ionian channel — the corridor of water Sagittario patrolled during the war. The Battle of Crete sites lie some 300 km to the southeast.