Rubuta ci gaba don wannan sakin layi - A 1941 ya shiga Royal Air Force, kuma ta hanyar hunturu ya tashi yaƙi tare da No. 121 (Eagle) Squadron, wanda ya ƙunshi 'yan sa-kai na Amurka. Pilot Officer Mahon ya lalace da mayakan Jamus uku da biyu Focke-Wulf Fw 190s a watan Afrilu da kuma Messerschmitt Bf 109 a watan Mayu, kafin ya ci nasararsa ta farko da aka tabbatar da Fw 190s biyu, wanda aka saukar a yankin Saint-Omer, a ranar 8 ga Yuni, 1942. A ranar 31 ga watan Yuli ya lalata wasu Fw 190s guda biyu a yankin Berck-Sur-Mer kuma ya zama ace yayin da yake rufe harin kwamandojin a kan Dieppe
, 19 ga Agusta, 1942, aikinsa na matukin jirgin sama na 98. A 08:30, yana tashi da Spitfire Vb, wanda ake wa lakabi da "Barry", Mahon ya harbe Fw 190 da wani Fw 190 kafin a buga jirginsa kuma an tilasta masa ya fice daga jirgin da ke konewa. Da ya sauka a cikin teku, aka kama shi. Kodayake Mahon ya gabatar da da'awar kashe 'yan Jamus biyu a wannan rana, an ba shi daraja ne kawai bayan yakin. Don haka, don rikodin rikodin biyar da aka tabbatar, biyu masu yiwuwa da uku da suka lalace Mahon sun sami Gicciye na Jirgin Sama na Burtaniya a 1985.