Rubuta ci gaba don wannan sakin layi - Ga mafi yawan shekaru biyu na farko, 70th Indiana ya yi aikin bincike da kuma kula da hanyoyin jirgin kasa a Kentucky da Tennessee. A shekara ta 1864, Harrison da rundunarsa sun shiga William T. Sherman Atlanta Campaign kuma suka koma gaba. Ranar 2 ga Janairu, 1864, Harrison ya ci gaba da zama kwamandan Brigade na 1 na 1st Division na XX Corps. Ya umurci brigade a yakin Resaca
, Cassville, New Hope Church, Lost Mountain, Kennesaw Mountain, Marietta, Peachtree Creek, da kuma Atlanta. Lokacin da babban sojojin Sherman ya fara tafiya zuwa teku, an tura brigade na Harrison zuwa gundumar Etowah kuma ya shiga cikin yakin Nashville.