The Orjen class of eight motor torpedo boats was built for the Royal Yugoslav Navy between 1936 and 1939 at the Lürssen Shipyard at Vegesack, Germany. They were based on the German S-2 motor torpedo boats. At the start of the Axis invasion of Yugoslavia, two boats managed to escape to Alexandria in Egypt where they continued serving with Allied forces, including in operations against Vichy French forces in Syria. The remaining ones were captured by Italian forces and commissioned in the Regia Marina (Royal Italian Navy) with modified armament; they were also used by the Italians as the model for the Italian-built CRDA 60 t motor torpedo boats.