Rubuta ci gaba ga wannan sakin layi - A 1798, Wallis ya umurci Janar na Venetia. A shekara mai zuwa, a lokacin Yaƙin Haɗin Kai na Biyu, ya umurci wani ɓangare na sojojin Habsburg a Swabia a ƙarƙashin Archduke Charles. Ya jagoranci rukuni na uku a cikin harin da ya kai kan matsayin Faransa a cikin nasarar Habsburr akan Janar na Division Jordan's Army of the Danube a yakin Ostrach
a ranar 21 ga watan Maris. Bayan mako guda, kuma a cikin nasarar da Faransa ta yi a Stockach a ranar 25 ga Maris, ya jagoranci bangaren dama. Daga ranar 14 zuwa 25 ga Afrilu, yayin da Archduke Charles ba shi da lafiya, Wallis ya dauki umurnin babban rundunar Habsburg da ke bakin kogin Rhine. Bayan 'yan makonni, ya umurci ajiyar a cikin Yaƙin farko na Zürich a ranar 4 ga Yuni, inda Janar Janar André Masséna, wanda ke jagorantar Sojojin Danube da Sojojin Switzerland, ya ci nasara kuma aka tilasta masa janyewa a ƙetaren kogin Limmat. A lokacin yakin, Wallis ya jagoranci runduna biyar na grenadiers a cikin hare-haren Faransa a Dutsen Zürich. Ya ji rauni sosai, kuma ya mutu makonni biyar bayan haka, a ranar 19 ga Yuli 1799.