Rubuta ci gaba don wannan sakin layi - Mortier ya yi aiki a cikin Yaƙe-yaƙe na Juyin Juya Halin Faransa a cikin kamfen na 1792 da 1793 a kan iyakar arewa maso gabas da Netherlands, kuma daga baya a kan Meuse da Rhine. Janar Jacques Maurice Hatry ya ba Mortier aikin yin shawarwari game da mika wuya ga sansanin soja na Mainz, wanda ya kammala cikin nasara sannan ya koma Paris. A lokacin Yaƙin Coalition na Biyu a cikin 1799, an daukaka shi zuwa janar janar sannan kuma janar janar. A lokacin yakin Zurich na biyu
, ya jagoranci rundunar 8,000 a cikin harin daga Dieticon a Zurich. Halinsa na aikin Faransa na Hanover, wanda ya haifar da Yarjejeniyar Artlenburg, ya jagoranci Napoleon ya hada da Mortier a cikin jerin sunayen marshals na farko da aka kirkiro a 1804.