The peak of Bomber Command operations occurred in the raids of March 1945, when its squadrons dropped the greatest weight of bombs for any month in the war. Wesel in the Rhineland, bombed on 16, 17, 18 and 19 February, was bombed again on 23 March, leaving the city "97 percent destroyed". The last raid on Berlin took place on the night of 21/22 April, when 76 Mosquitos made six attacks just before Soviet forces entered the city centre. By this point, most RAF bombing operations were for the purpose of providing tactical support. The last major strategic raid was the destruction of the oil refinery at Vallø (Tønsberg) in southern Norway by 107 Lancasters, on the night of 25/26 April.