Cika wannan jumla: don neman aiki a rundunar sojan Rasha. A watan Fabrairun shekara ta 1676 ya je Moscow, amma ma'aikatan soja sun ƙi shi. Posolsky Prikaz ya lissafa shi a matsayin baƙon baƙo. Le Fort ya zauna a cikin abin da ake kira Nemetskaya sloboda a Moscow, inda zai sami girmamawa tsakanin sauran manyan baƙi. A watan Yuli na shekara ta 1678, ya sake neman aiki a rundunar tsarist. Da aka karɓa tare da matsayin kyaftin, Le Fort ya tafi daya daga cikin fronts a lokacin yakin basasa.
Yaƙin Rasha da Turkiyya na 1676 <unk> 1681. A farkon 1679 an umurce shi da ya shiga garkuwar Kiev karkashin umurnin Yarima Vasily Golitsyn da Janar Patrick Gordon. Bayan dawowarsa Moscow daga wani ɗan gajeren tafiya zuwa Geneva a 1683, Le Fort ya gudanar da ayyukan diflomasiyya daban-daban har zuwa kaka na 1685.