During the Siege of Calais, "Greyhound" and her sister provided naval gunfire support for the 30th Motor Brigade on 25 and 26 May. On 28 and 29 May she evacuated 1,360 men from Dunkirk before she was damaged by German bombers. The ship was towed out of the harbour by the Polish destroyer . After her repairs were completed at Chatham Dockyard on 17 June, "Greyhound" rejoined her flotilla at Dover. On 30 July the ship, and her sister , escorted the aircraft carrier to Gibraltar and "Greyhound" was assigned to the 13th Destroyer Flotilla based there. The ship participated in Operations Hats at the end of August when the British reinforced the Mediterranean Fleet.