RMS Leinster was a 3,069-ton packet steamship operated by the City of Dublin Steam Packet Company, serving as a mailboat between Kingstown (Dún Laoghaire) and Holyhead. Built at Laird's shipyard in Birkenhead, England, in 1895, she featured a twin-propeller configuration powered by two independent four-cylinder triple-expansion steam engines, enabling a service speed of approximately 24 knots (44 km/h). Her design reflected her role as a fast, reliable mail and passenger vessel, with a length and build suitable for crossing the Irish Sea. During her service, RMS Leinster was armed for wartime, equipped with one 12-pounder gun and two signal guns, reflecting her dual role in civilian and military contexts. She could carry up to 77 crew members and nearly 700 passengers, including civilians, postal workers, and military personnel from various Allied nations. Her passenger list on her final voyage included notable figures, military personnel, nurses from multiple countries, and civilians, some of whom were prominent or socially notable. On 10 October 1918, while en route for Holyhead in heavy seas, RMS Leinster was torpedoed by the German submarine UB-123 just outside Dublin Bay, near the Kish Bank. Despite efforts to return to port, she was struck by multiple torpedoes—initially one that passed ahead of her, followed by two that struck her forward and caused her to settle by the bow before sinking rapidly after a third explosion. The attack resulted in at least 564 fatalities, making it one of the largest single losses of life in the Irish Sea, with many victims including civilians, military personnel, nurses, and officials. The sinking was notable for its scale and the presence of rescue operations involving ships like HMS Lively, HMS Mallard, HMS Seal, and the former fishery protection vessel HMY Helga. The vessel's anchor was recovered in 1991 and later memorialized, and her sinking has been commemorated through stamps and memorial events. RMS Leinster’s wreck site and her history hold a significant place in Irish maritime history, symbolizing the peril faced by civilian and military maritime traffic during World War I.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.