▁victory ▁on ▁ 2 3 ▁July ▁ 1 9 4 1 ▁in ▁defense ▁of ▁a ▁Royal ▁Air ▁Force ▁( RA F ) ▁" Circ us " ▁mission ▁flow n ▁by ▁No . ▁ 1 1 ▁Group . ▁He ▁shot ▁down ▁a ▁Super marine ▁Sp it fire ▁f ighter ▁north west ▁of ▁H es din , ▁which ▁according ▁to ▁C ald well ▁was ▁un conf ir med . ▁He ▁file d ▁his ▁second ▁claim ▁on ▁ 2 7 ▁September ▁following ▁combat ▁with ▁Sp it f ires ▁in ▁the ▁vic inity ▁of ▁Bou log ne . ▁That ▁day , ▁the ▁R AF ▁fle w ▁two ▁" Circ us " ▁miss ions , ▁No . ▁ 1 0 3 A ▁attack ing ▁the ▁Am iens ▁motor ▁yards , ▁and ▁No . ▁ 1 0 3 B , ▁target ing ▁the ▁Maz ing arbe ▁power ▁station . ▁On ▁ 6 ▁November , ▁Gall and ▁claimed ▁a ▁Royal ▁Australian ▁Air ▁Force ▁( RA AF ) ▁Sp it fire ▁from ▁No . ▁ 4 5 2 ▁Squadron ▁shot ▁down ▁in ▁the ▁area ▁of ▁Cal ais , ▁his ▁last ▁claim ▁in ▁ 1 9 4 1 . ▁ ▁On ▁ 2 8 ▁March ▁ 1 9 4 3 , ▁the ▁R AF ▁conducted ▁a ▁" R ode o " ▁f ighter ▁swe eps ▁over ▁enemy ▁territory . ▁In ▁its ▁defense , ▁II . ▁Gruppe ▁was ▁called ▁to ▁action ▁when ▁an ▁attack ▁on ▁Bou log ne ▁was ▁im min ent . ▁The ▁Horn ch urch ▁Wing ▁engaged ▁the ▁St ab ▁(