Force H but was unable to attack it, and was subject to anti-submarine search by escorts. During August 1941 Alagi patrolled between Sardinia and La Galite Island. She spent November and December 1941 patrolling off Cape Fer. In the late afternoon of 14 January 1942, in the Strait of Sicily, Alagi sighted a British naval formation and at 21:05 launched two torpedoes, which did not hit any targets. On 8 June 1942, roughly 20 nm North of Cape Bon Alagi, under command of captain Sergio Puccini, fired three torpedoes at a naval column (later identified as friendly convoy from Naples to Tripoli). One torpedo hit and sunk the Italian destroyer Antoniotto Usodimare in a friendly fire incident (141 killed and 165 survivors). On 12 July 1942 at 20:04, at , northwest of Tripoli, Syria, Alagi fired two torpedoes and scored one hit in the engine room of the Turkish tanker Antares (3723 GRT, 1893) on a trip from Iskanderun to Haifa, causing her to be beached on Ruad Island. The tanker was later re-floated, towed to Turkey and scrapped in late 1943. In August 1942 Alagi operated along the Regia Marina and Luftwaffe to intercept and block an Allied convoy to Malta (Operation Pedestal). On 12 August 1942 at 21:05, at , Alagi fired a spread of 4 torpedoes against a merchant and a cruiser, and immediately dove. 3 explosions were heard. At 21:12 cruiser was hit forward by one of four torpedoes and sustained damage to bow structure. was able to make 25 knots and remained with the convoy to continue operating in defense of merchants. The other 2 torpedoes hit and sunk M/V Clan Ferguson which was previously damaged by a bomb from Ju 88. On 8 November 1942, while sailing submerged to her area of operation near Bizerta, she collided underwater with another Italian submarine and suffered serious damage to her tower and had to turn back and return to Naples. In December she first patrolled between Cape Bougaroun, island of La Galite and Cape Fer and then from 29 December near Bona, Algeria. In January 1943 Alagi patrolled northeast of Bona. From February to June 1943 she conducted several patrols south and southwest of Sardinia. In July 1943 Alagi first patrolled south of Sardinia, and later provided defensive screen in the waters of Sicily. On 16 July at 6:13, at , she intercepted a column of