On her next patrol, Sahib sank a large Italian merchant ship, then damaged a coastal trading vessel.

In her next patrols, Sahib sank the German submarine U-301, two Italian merchant ships, and two small sailing vessels.

On 24 April 1943, Sahib sank a heavily protected Italian merchant; however, she was then attacked with depth charges and forced to surface.

On 10 May 1942, Sahib, under the command of Lieutenant J. H. Bromage, sailed from the shipbuilding yards to Holy Loch, where she was commissioned into the Royal Navy three days later.

On 11 July, Sahib fired six torpedoes at the German submarine U-658 but missed, then ended her patrol in Lerwick the next day.

U-84's captain decided not to engage in a gunnery duel with the British submarine and dived before Sahib could fire more than three shells.

On 22 October, Sahib launched four torpedoes at the heavy cargo/passenger ship Calino but missed, and was subsequently attacked with depth charges by the Italian destroyer Antonio Mosto but escaped unscathed.

Sahib first fired two shells at the cargo ship and then launched a single torpedo, which hit Scillin's hold and rapidly sank her.

Sahib rescued 27 POWs (26 British and one South African), Scillin's captain and 34 Italian crew and soldiers.

Sahib was then forced to depart after she detected Sonar echo pings and sighted an unidentified ship approaching.

After patrolling for four days, Sahib torpedoed and sank the German merchant ship Oued Tiflet southwest of Savona, Italy.

According to Sahib's log the U-boat was first spotted proceeding on the surface early that morning at a distance of 4.5 miles (7.2 km).

Sahib closed to 2.6 miles (4.2 km) and into a more favourable position before firing a full salvo of six torpedoes at five second intervals.

Lieutenant Ian Edward Fraser was subsequently awarded the Distinguished Service Cross for his actions aboard Sahib during the sinking of U-301.

She attacked and damaged with gunfire the Italian vessels Francesco Padre and Santa Teresa no.233 off Capo d'Orlando, Sicily on 18 February, then on the 21st ended her patrol in Malta.

Sahib next attacked five sailing vessels with her deck gun on 30 March; she sank Santa Maria Del Salvazione and San Vincenzo and damaged two others.

At midday on 23 April, Sahib sank the Italian tug Valente with gunfire south of Cape Vaticano.

On 24 April 1943, Sahib sighted the Italian merchant ship Galiola 2 miles (3.2 km) off Capo di Milazzo, Sicily.

Galiola was escorted by the torpedo boats Climene and Angelo Bassini, and the Gabbiano-class corvettes Gabbiano and Euterpe, as well as two aircraft.

[6] Many of Sahib's former crew escaped from prison camps in September 1943 and hid in the countryside hills until the liberation of Italy by the Allies.

[14] During her service with the Royal Navy, Sahib sank ten Axis ships for a total of 12,383 GRT as well as a German u-boat.