[1][2] The trawler was sold to Wyre Steam Trawling Co. Ltd of Fleetwood on 26 October 1917 and was returned to the company in September 1919, ten months after the end of the war.

[1] On 14 February 1931, Caldew, along with fellow trawlers Dhoon and River Clyde, responded to a distress call made by the Finnish steamship Malve, which had run aground on the island of Tiree in gale-force winds.

[1] The collision tore a large hole in the Ospray II, causing fatal damage and leading to the trawler's sinking less than an hour later.

[1] On 16 September 1939, fifteen days after the outbreak of the Second World War, the Caldew, captained by Skipper Thomas Kane with twelve crewmen on board, set sail from Fleetwood to the Faroe Islands fishing grounds.

[1] The crew were ordered to sail away from the ship in a lifeboat, after which the trawler was sunk by the German submarine's 8.8 cm SK C/35 naval gun at 60°28′N 6°12′W / 60.47°N 6.20°W / 60.47; -6.20.

[1] The Caldew's crew were rescued by the Swedish steamer Kronprinsessan Margaeta, which itself was intercepted by the German destroyer Friedrich Ihn and torpedo boat Iltis on 27 September.