Thorn had a short-lived career, serving in the Mediterranean.
Commencing operations in late 1941, Thorn sank the German tanker Campina, the Italian tanker Ninuccia, the Italian submarine Medusa, the Italian auxiliary patrol vessel AS 91 / Ottavia and the Italian transport ship Monviso. She also attacked an Italian convoy in the central Mediterranean, but failed to hit any ships.[1]
On 6 August 1942 Thorn encountered the Italian torpedo boat Pegaso, escorting the steamer Istria from Benghazi, off southern Crete. Pegaso spotted an escorting aircraft machine-gunning the sea’s surface and moved in to investigate. Just four minutes after the aircraft’s attack the Pegaso picked up a sonar contact and carried out seven attacks after which contact was lost. Thorn failed to return from the patrol and is believed to have been lost in this attack. She was declared overdue on 11 August 1942.[2]
