Rubuta ci gaba don wannan sakin layi - Defrance kuma ya yi aiki a cikin Kamfen na Switzerland na 1799 a matsayin Babban Jami'in Ma'aikata na 1st Division na Jean-Baptiste Jourdan na Sojojin Danube; bayan asarar a yakin Ostrach
kuma Stockach a watan Maris na 1799, an hada Sojojin Danube tare da Sojojin Helvetia, a karkashin umurnin Andre Massena. Defrance ya ci gaba a matsayinsa na shugaban ma'aikata. A yakin farko na Zurich a watan Yunin 1799, an nada shi a fagen a matsayin brigadier janar, girmamawa wanda ya ƙi, yana neman a ba shi umurnin rundunar sojan doki. Ya karbi umurnin 12th Regiment na "Chasseurs-a-Cheval". A matsayin "Chef-de-Brigade", wanda ya dace da colonel a cikin sojojin Faransa na juyin juya hali, Defrance ya tafi Italiya kuma ya shiga cikin ayyukan da suka kai ga yakin Marengo. A lokacin hunturu na 1800-1801, ya yi yaƙi a Grisons a Switzerland kuma ya koma Faransa bayan Yarjejeniyar Lunéville a 1801.