 After working up , the ship was briefly assigned to Western Approaches Command on escort duties before she was transferred to the 18th Destroyer Flotilla at Freetown , Sierra Leone , where she arrived on 28 April . Boreas remained there until she joined Convoy <unk> 70 on 10 August at Gibraltar . The ship rescued survivors from four ships and returned them to Gibraltar on 25 August . She received a lengthy refit at South Shields from 19 September to 4 January 1942 , after which rejoined the 18th Destroyer Flotilla on 25 January . 
