 Johnson was credited with 34 individual victories over enemy aircraft , as well as seven shared victories , three shared probable , 10 damaged , three shared damaged and one destroyed on the ground . Johnson flew 700 operational sorties and engaged enemy aircraft on 57 occasions . Included in his list of individual victories were 14 Messerschmitt Bf 109s and 20 Focke @-@ Wulf Fw 190s destroyed making him the most successful RAF ace against the Fw 190 . This score made him the highest scoring Western Allied fighter ace against the German Luftwaffe . 
