Rubuta ci gaba don wannan sakin layi - A 1860, Parnell ya isa Amurka kuma ya shiga rundunar sojojin Amurka a Brooklyn, New York lokacin da yakin basasar Amurka ya fara a shekara mai zuwa. Ya zama memba na 4th Regiment New York Volunteer Cavalry, wanda aka fi sani da "Dickel's Mounted Rifles", wanda ke aiki da farko tare da Sojojin Potomac. A cikin shekaru biyu na farko na yakin, ya kasance wani ɓangare na Colonel Louis Blenker ta kamfen a Shenandoah Valley da West Virginia. Ya kuma ga aikin a yakin Cross Keys, Port Republic, Cedar Mountain, da kuma yakin Bull Run na biyu. Tare da Rundunar Sojoji, ya kuma yi yaƙi a yakin Fredericksburg, Beverly Ford, Brandy Station, Stoneman's Raid, Aldie, da Middleburg. A ranar 21 ga Yuni, 1863, an kama shi bayan ya jagoranci wani dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun. Ya tsere watanni biyu bayan haka kuma ya tafi Petersburg, West Virginia inda ya sake saduwa da rundunarsa. Daga baya ya ga aikin a yakin daji, Spotsylvania, Trevilian Station, Petersburg, Lee's Mills, Winchester
da kuma Cedar Creek a tsakanin sauran alkawura.