HMS Ivanhoe was an built for the Royal Navy in the mid-1930s. During the Spanish Civil War of 1936–1939, the ship enforced the arms blockade imposed by Britain and France on both sides as part of the Mediterranean Fleet. Before the start of World War II, the ship was modified so that she could be used to lay mines by removing some of her armament. Ivanhoe was transferred to Western Approaches Command shortly after the war began and helped to sink one German submarine in October 1939. She was converted to a minelayer while undergoing a refit in November–December and laid minefields in German coastal waters as well as anti-submarine minefields off the British coast until she was reconverted back to her destroyer configuration in February 1940. Ivanhoe reverted to her minelaying role during the Norwegian Campaign in April 1940 and then laid a number of minefields off the Dutch coast during the Battle of the Netherlands in May. The ship participated in the Dunkirk evacuation until she was badly damaged by German aircraft on 1 June. On her first minelaying mission after her repairs were completed, she struck a German mine and had to be scuttled on 1 September 1940 during the Texel Disaster.
Description
The I-class ships were improved versions of the preceding H-class. They displaced at standard load and at deep load. The ships had an overall length of , a beam of and a draught of . They were powered by two Parsons geared steam turbines, each driving one propeller shaft, using steam provided by three Admiralty three-drum boilers. The turbines developed a total of and were intended to give a maximum speed of . The ships carried enough fuel oil to give them a range of at . Their crew numbered 145 officers and ratings.
The ships mounted four 4.7-inch (120 mm) Mark IX guns in single mounts, designated 'A', 'B', 'X' and 'Y' from bow to stern. For anti-aircraft (AA) defence, they had two quadruple mounts for the 0.5 inch Vickers Mark III machine gun. The I class was fitted with two above-water quintuple torpedo tube mounts for British 21 inch torpedo| torpedoes. One depth charge rack and two throwers were fitted; 16 depth charges were originally carried, Ivanhoe was one of the four I-class destroyers fitted with minelaying equipment in late 1938 – January 1939 at Malta. This consisted of mounts for rails on the deck on which to carry the mines and an electric winch to move the mines down the rails. A pair of sponsons were added to the stern to allow the mines to clear the propellers when dropped into the sea. 'A' and 'Y' guns and both sets of torpedo tubes were modified to allow them to be removed to compensate for the weight of the mines. The ships could carry a maximum of 72 mines. The I-class ships were fitted with the ASDIC sound detection system to locate submarines underwater.
Construction and career
The ship was ordered from Yarrow Shipbuilders at Scotstoun on 30 October 1935 under the 1935 Naval Programme. The ship was laid down on 12 February 1936 and launched on 11 February 1937 as the second Royal Navy warship to carry the name. Ivanhoe was completed on 24 August 1937 and cost £259,371 excluding items supplied by the Admiralty such as guns and communications equipment.
Ivanhoe was in transit between Alexandria and Malta when the Second World War began in September 1939 but she was in Plymouth on 14 September as the 3rd Destroyer Flotilla had been transferred to the Western Approaches Command for escort duties. She was refitted at Sheerness Dockyard and converted to a minelayer from 14 November to 13 December. Ivanhoe was transferred to the specialist minelaying 20th Destroyer Flotilla on 12 December and laid her first minefield, along with the other three ships of the flotilla, at the mouth of the Ems estuary on the night of 17/18 December. Another minefield was laid on the night of 2/3 January 1940 by Ivanhoe and Intrepid and they then laid a series of anti-submarine minefields later in the month. The ship replaced her guns and torpedo tubes at Portland from 27 January to 3 February and resumed her former duties. Later in the month, the ship carried troops of the 15th Infantry Brigade to Åndalsnes. Ivanhoe then loaded mines and laid a minefield in the approaches to Trondheim, together with Icarus and , on the night of 29/30 April.
After a boiler cleaning (7–15 May) Ivanhoe, , and , laid 164 mines off the Hook of Holland on the night of 15/16 May. Three German minesweepers were sunk by this minefield on 26 July. Three nights later, the same three ships, reinforced by Intrepid, Impulsive, and the auxiliary minelayer laid a minefield off the Dutch coast. Princess Victoria struck a German mine on the voyage home and was sunk; the destroyers rescued the ship's survivors. They laid five more minefields off the Dutch coast before the end of the month. On 29 May, the ship was transferred to the Dunkirk evacuation effort and ferried 930 troops to Dover that day. She also took aboard the crew of the badly damaged destroyer and then scuttled Grafton. She was withdrawn from the evacuation on 30 May as too valuable to risk, but this decision was reversed the following day and Ivanhoe evacuated 1,290 men to Dover. On the morning of 1 June, already having loaded troops, the ship was attacked off Dunkirk harbour by German aircraft. Two bombs missed to port and starboard, but the third detonated above the upper deck and flooded the two forward boiler rooms. The bomb killed 26, including five soldiers, and wounded many others. No. 3 boiler room was still operable and the ship reached Dover under her own power. The ship quickly sank afterwards at position .