Vimiera was chosen for conversion to an escort destroyer (WAIR) with an enhanced anti-aircraft and anti-submarine capability as part of the naval rearmament programme preceding the outbreak of war in September 1939. Conversion was complete, whereon in January 1940 she joined the Nore Command for coastal convoy escort duty in the North Sea and English Channel. Her company was formed largely of men from the Clyde Division of the Royal Naval Reserve, HMS Graham.
In April 1940 she was transferred under the Commander-in-Chief, Dover to support military operations in France. This included the Battle of Dunkirk to providing additional anti-aircraft defence in Dunkirk (Operation FA) and assisting in the evacuation of allied personnel from Flushing. With HMS Wolsey she provided naval gunfire support for military operations at Escault. On 19 May she rescued survivors from HMS Whitley and in the following days she assisted both in taking reinforcements to Boulogne and in evacuating wounded soldiers and medical staff. (One soldier she evacuated was the actor Arnold Ridley.) Alongside HMS Wessex, ORP Burza, HMS Whitshed, and HMS Wolfhound she saw action around Boulogne and Calais, during which Wessex was sunk and Vimiera sustained substantial damage. She was taken into repair on 25 May 1940, and so was not involved in the evacuation from Dunkirk. She was subsequently redeployed to the North Sea in defence of East Coast convoys.
In December 1941, she was adopted by the civil community of Sandbach, Cheshire, following the successful Warship Week National Saving campaign. Vimiera, under the command of Lieutenant-Commander Angus Alexander Mackenzie, RNR, was sunk by a mine in the Thames estuary off East Spile Buoy, near the Isle of Sheppey on 9 January 1942 with the loss of around 96 hands. 92 or 93 went down with the ship, and a further four of the 38 survivors died of wounds.[2][3][4] The survivors were brought to sghore and tended to at Sheerness.[5]
Eight of her nine officers survived, and Lt. Cdr. Mackenzie, having been found blameless in the sinking, was put in command of HMS Liddesdale.[6]Vimiera's loss was commemorated on a memorial within HMS Graham.[citation needed]
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