Last resort target of Saarbrucken attacked due to engine trouble. Port outer feathered as it was thought damaged by ack-ack as it cut without report. When port inner cut suspected immersion pump and changed t centre tanks. Inner picked up immediately so outer unfeathered and picked up. Attacked by Me 109 20-40 miles from coast on return. Rear gunner hit Me in burst and Me immediately burst into flame and seemingly split in two and floated down.