Rubuta ci gaba ga wannan sakin layi - A 1870, a lokacin yakin Franco-Prussian, Failly ya umurci 5th Corps. Rashin aikinsa a Bitche a ranar 6 ga watan Agusta yayin da aka murkushe rukunin 1 a hannun dama da na 2 a hagunsa a yakin Wörth da Spicheren
bi da bi, ya haifar da mafi girman fushi a Faransa. Failly sa'an nan kuma ya umurci sashin dama na Marshal de Mac-Mahon na "Sojojin Châlons" a lokacin yakin Sedan, kuma sakamakon bala'in wannan yakin ya kasance wani ɓangare na dabarun Failly, ko da yake ba shi da laifi fiye da sauran shugabannin Faransa. Failly da rundunarsa ta 5 sun yi nasara a Beaumont a ranar 30 ga Agusta 1870 ta hanyar runduna biyu da George na Saxony ya jagoranci. A cikin wannan yaƙin an mamaye Faransanci a cikin sansanonin su kuma an tura su zuwa Mouzon. Rashin nasarar ya rufe hanyar tserewa ta kudu kuma ya tilasta wa Faransa "Sojojin Châlons" zuwa kan iyakar Belgium da kewaye a Sedan. 'Yan Prussian sun kama shi a Sedan a ranar 2 ga Satumba, amma an sake shi' yan watanni bayan haka.