Kammala jumla mai zuwa: Bayan wani lokaci a matsayin mai koyarwa a Birtaniya, Plagis ya koma aiki a watan Satumba na 1943 a matsayin kwamandan Squadron na 64, yana tashi da Spitfire Mk VCs a arewacin Faransa. Ya dauki umurnin No. 126 (Persian Gulf) Squadron a watan Yunin 1944, kuma ya jagoranci hare-haren da yawa a kan matsayi na Jamus a lokacin mamaye Faransa da Birtaniya.
yaƙin da ya biyo baya; an harbe shi a kan Arnhem a lokacin Operation "Market Garden", amma kawai rauni ne kawai. Bayan canzawa zuwa Mustang IIIs, ya umurci wani reshe da aka kafa a RAF Bentwaters wanda ya goyi bayan aikin fashewar bama-bamai. Ya gama yakin tare da mukamin shugaban rundunar soji kuma ya kasance tare da RAF bayan haka, yana aiki da Gloster Meteors a shugaban No. 266 (Rhodesia) Squadron.