th ▁arr ondissement ▁on ▁ 1 0 ▁August . ▁ ▁On ▁ 1 5 ▁October ▁Ar phe uil ▁was ▁promoted ▁to ▁lieutenant , ▁and ▁he ▁returned ▁to ▁duty ▁on ▁ 2 0 ▁November . ▁He ▁was ▁transferred ▁to ▁the ▁Army ' s ▁av iation ▁branch ▁– ▁the ▁Aer onaut ique ▁Mil itaire ▁– ▁on ▁ 1 5 ▁January ▁ 1 9 1 7 . ▁He ▁received ▁his ▁basic ▁flight ▁training ▁at ▁the ▁military ▁flying ▁school ▁at ▁Av ord , ▁and ▁was ▁awarded ▁military ▁pilot ' s ▁certificate ▁No . ▁ 5 8 6 1 ▁at ▁T ours ▁on ▁ 8 ▁April . ▁On ▁ 1 6 ▁June ▁he ▁was ▁posted ▁to ▁Esc adr ille ▁N . 1 5 1 , ▁a ▁newly ▁created ▁unit ▁station ed ▁in ▁Ch aux ▁near ▁B elf ort ▁to ▁fly ▁N ieu port ▁f igh ters . ▁His ▁unit ▁saw ▁little ▁action ▁for ▁the ▁rest ▁of ▁the ▁year , ▁at ▁the ▁end ▁of ▁which ▁it ▁began ▁to ▁receive ▁SP AD ▁f igh ters . ▁Event ually ▁Ar phe uil ' s ▁unit , ▁now ▁red es ign ated ▁Esc adr ille ▁S PA . 1 5 1 , ▁was ▁moved ▁to ▁the ▁O ise ▁after ▁the ▁start ▁of ▁the ▁ 1 9 1 8 ▁German ▁Spring ▁Off ensive . ▁On ▁ 2 7 ▁May ▁ 1 9 1 8 ▁he ▁claimed ▁an ▁aircraft ▁shot ▁down ▁during ▁a ▁dog f ight ▁with ▁five ▁Germ ans , ▁but ▁was ▁not ▁cred ited . ▁However , ▁the ▁following ▁day ▁he ▁shot