Attacked by N/F. 4 times. Oxygen system partially u/s, hydarulics u/s. Bomb doors haging open from attack. Elevators and rudders damaged. Rudder trimmers u/s. Compasses u/s. No.1 petrol tank holed and electrical system burnt out. Landed at Docking. Nav. awarded CGM. Pilot and TT. awarded immediate DFC's.