Kammala jumla mai zuwa: An sanya Quesnel a cikin aikin aiki tare da Sojojin Italiya a ranar 6 ga Fabrairun 1799. A farkon yakin na biyu na Coalition, Quesnel ya jagoranci brigade a cikin sashin Paul Grenier. Rukunin ya kunshi bataliya uku kowannensu na 17th, 24th, da 106th Demi-Brigades, bataliya daya kowannensu na 2nd Helvetica Legion da 1st Polish Legion, 450 sojan doki, da kuma bindigar bindiga guda daya. Ya jagoranci tawagarsa a yakin Verona a ranar 26 ga Maris, 1799, yakin Magnano a ranar 5 ga Afrilu, da yakin Cassano a ranar 27 zuwa 28 ga Afrilu. A yakin Bassignana a ranar 12 ga Mayu 1799, an harbe shi a hannun hagu. A cikin
Yaƙin Novi (1799) Quesnel ya jagoranci brigade a cikin rukunin Pierre Garnier de Laboissière. Rundunar ta kunshi 17th Light da 63rd Line Infantry Regiments. Raunin rauni na hannu a ƙarshe ya tilasta masa ya ɗauki hutu daga sojojin. Farawa a ranar 1 ga Yuni, 1801, Quesnel yana da matsayi na soja a Jamhuriyar Cisalpine. Shekaru biyu bayan haka ya dauki umurnin sojojin kusa da Faenza.