Kammala jumla mai zuwa: Bayan an tura Massachusetts na 21 zuwa Arewacin Virginia a watan Yulin 1862, kungiyar ta zama wani bangare na Sojojin Potomac kuma ta shiga cikin manyan fadace-fadace da yawa na yakin da suka hada da Bull Run na biyu, Antietam, da Fredericksburg. Rundunar ta sha wahala mafi yawan asarar rayuka a lokacin yakin.
Yaƙin Chantilly a ranar 1 ga Satumba, 1862. A cikin rikice-rikice na yakin, ya yi yaƙi a cikin gandun daji mai zurfi a lokacin hadari, Clark ya rabu da rundunarsa kuma ya yi yawo a cikin yankunan karkara na Virginia na tsawon kwanaki hudu kafin ya sake samun sojojin. Duk da yake ya ɓace, an rubuta shi ba daidai ba a matsayin wanda aka kashe a cikin aikin kuma jaridar Amherst ta buga labarin mutuwarsa a ƙarƙashin taken, "Wani Jarumi ya tafi".