Mezue ahịrịokwu na-esonụ: Defrance rụkwara ọrụ na Switzerland Campaign nke 1799 dị ka onye isi ndị isi nke ndị isi nke 1st Division nke Jean-Baptiste Jourdan's Army of the Danube; mgbe ọ nwụsịrị na agha nke
Ostrach na Stockach na Machị 1799, ndị agha nke Danube jikọtara ya na ndị agha nke Helvetia, n'okpuru iwu nke Andre Massena. Defrance gara n'ihu n'ọrụ ya dịka onye isi ndị ọrụ nke ngalaba. Na mbuso agha nke mbụ nke Zurich na June 1799, a họpụtara ya n'ọgbọ agha dị ka brigadier general, nsọpụrụ nke ọ jụrụ, na-arịọ kama ka e nye ya iwu nke ndị agha na-agba ịnyịnya. Ọ natara iwu nke 12th Regiment nke "Chasseurs-a-Cheval". Dị ka "Chef-de-Brigade", nke kwekọrọ na onye ọchịagha na ndị agha France nke oge mgbanwe, Defrance gara Italy ma sonye na omume ndị dugara na Agha nke Marengo. N'oge oyi nke 1800-1801, o mere mkpọsa na Grisons na Switzerland wee laghachi France mgbe nkwekọrịta nke Lunéville na 1801.