Rubuta ci gaba don wannan sakin layi - Da farko an sanya shi zuwa I Corps, a watan Yuni 1862, an tura sashin zuwa Virginia Peninsula inda ya yi aiki tare da V Corps na Sojojin Potomac a lokacin Yaƙin Peninsula. Daga nan sai sashen ya koma tsohuwar rundunarsa (wanda a lokacin aka sanya shi III Corps a cikin Sojojin Virginia) a lokacin yakin Bull Run na biyu. Ƙungiyar mahaifiyar ƙungiyar ta sake dawo da sunan I Corps kafin yakin Antietam lokacin da ya koma Army of the Potomac. Rukunin ya shiga cikin yakin Kudancin Mountain, Antietam, da Fredericksburg, musamman ma ya bambanta kansa a Fredericksburg, inda ya shiga cikin layin Confederate. Tsakanin Fredericksburg da Gettysburg, rukunin ya kasance wani ɓangare na XXII Corps da aka sanya wa Washington, DC. Ya kasance wani ɓangare na V Corps kuma don yakin Gettysburg, inda ya bambanta kansa a ranar 2 ga Yuli, 1863, yana yaƙi a kusa da Little Round Top. Ɗaya daga cikin brigade ya kori sojojin Confederate daga gefen yammacin Little Round Top zuwa Wheatfield. A karkashin Crawford, Pennsylvania Reserves ya ci gaba da yin yaƙi da Sojojin Potomac har sai kafin yakin Bethesda Church ko yakin Totopotomoy Creek
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