▁and ▁Joseph ▁M . ▁X . ▁de ▁Sé vin ▁for ▁his ▁first ▁victory ▁on ▁ 1 1 ▁May ▁ 1 9 1 7 . ▁A ▁promotion ▁to ▁Ad j ut ant ▁followed ▁on ▁ 2 0 ▁July ▁ 1 9 1 7 , ▁with ▁a ▁further ▁promotion ▁to ▁S ous ▁lieutenant ▁on ▁ 2 5 ▁January ▁ 1 9 1 8 . ▁He ▁transferred ▁to ▁Esc adr ille ▁Sp a 1 5 4 ▁( which ▁operated ▁Sp ads ), ▁on ▁ 6 ▁March ▁ 1 9 1 8 . ▁Between ▁ 1 2 ▁April ▁and ▁ 2 2 ▁August ▁ 1 9 1 8 , ▁he ▁ran ▁off ▁a ▁string ▁of ▁five ▁vict ories ▁each ▁over ▁enemy ▁air plan es ▁and ▁observation ▁bal lo ons , ▁with ▁all ▁but ▁one ▁of ▁the ▁wins ▁being ▁shared ▁with ▁such ▁fellow ▁French ▁a ces ▁as ▁X avier ▁Mo iss in ac , ▁Paul ▁Bar bre au , ▁Louis ▁Pro s per ▁Gros , ▁Michel ▁Co iff ard , ▁Jacques ▁Ehr lich , ▁and ▁bal lo on ▁b uster ▁The oph ile ▁Con dem ine . ▁ ▁On ▁ 1 9 ▁September ▁ 1 9 1 8 , ▁he ▁was ▁transferred ▁to ▁his ▁final ▁w art ime ▁post , ▁with ▁Esc adr ille ▁S PA . 3 1 . ▁He ▁scored ▁his ▁final ▁triumph ▁solo ▁ten ▁days ▁later . ▁ ▁On ▁ 9 ▁November ▁ 1 9 1 8 , ▁he ▁was ▁awarded ▁the ▁L ég ion ▁d ' honneur ▁to ▁accomp any ▁his ▁prior ▁awards ▁of