Kammala wannan jumla: A shekara ta 1800, an tura Loison zuwa rundunar soji don ya jagoranci rundunar mutane 5,300 kuma ya haye babban St Bernard Pass tare da Napoleon. Ya ji rauni ya jagoranci wani harin da aka yi a kan Fort Bard a ranar 25 ga Mayu, 1800. Da sauri ya farfado, ya jagoranci rukunin sa a cikin Guillaume Philibert Duhesme na rundunar a cikin mayar da umarnin Josef Philipp Vukassovich. Ya rasa
Yaƙin Marengo saboda mutanensa sun shagaltu da kama Milan da Cremona, yayin da suke bin Austrians zuwa gabas.