Admiralty W-class destroyer HMS Wakeful (Cdr R. Fisher, RN) was torpedoed and sunk off Dunkirk on 29 May 1940. Wakeful was carrying 640 soldiers evacuated from Dunkirk. Only one soldier and 25 of the ship’s company survived the sinking. Survivors from Wakeful were rescued by the destroyer HMS Grafton (herself sunk later that day), minesweepers HMS Gossamer and HMS Lydd, and the Admiralty drifter HMT Comfort (also sunk that day).
HMS Wakeful (naval-history.net)