Tuhia he tomokanga mo tenei waahanga - I uru atu ia ki te mahi hoia mo te Pakanga a-Rohe i te raumati o te tau 1862, i uru atu a Buck i te Akuhata 17 ki Windsor, Connecticut, a ka whakauruhia hei hoia takitahi me te Kamupene A o te 21st Connecticut Volunteer Infantry. I whakawhiwhia ki te ope taua a te Uniana o te Potomac, ko ia me ona hoa 21 o Connecticut Volunteers i whawhai i te Pakanga o Fredericksburg mai i te Tihema 12-15 o taua tau. I a ia e mahi ana i te "Mati Mud" a Burnside, i whakatairangahia a Buck ki te taumata o te rangatira i te Hanuere 20, 1863. I uru ia me tana roopu ki te Siege o Suffolk i taua puna, kaitiaki me te tiaki i te taha o Portsmouth me Newport News i taua raumati, ngahuru me te hotoke. Ko tetahi waahanga o te haerenga a te Uniana i te taha o te awa o James o Virginia, i whakarewahia i te mutunga o Hanuere 1864, ka haere te 21st Connecticut Volunteers ma Fort Powhatan me Smithfield i mua i te haerenga ki North Carolina, i reira i mahi ai ratou i New Bern (12 Hui-tanguru), Plymouth, Washington me Blount's Creek i mua i te hokinga ki Portsmouth, Virginia i te mutunga o Paenga-whawha. I honoa ki nga ope o te Uniana e whai wāhi ana ki nga mahi ki a Petersburg me Richmond mo te nuinga o te puna me te raumati, i uru atu ratou ki Swift Creek, Fort Darling, te Pakanga o Drewry's Bluff
, Bermuda Hundred, me te White House i mua i te whawhai i nga pakanga tata ki Cold Harbor mo te nuinga o Pipiri me te pakanga o te poka i Bermuda Hundred mai i te mutunga o Akuhata tae atu ki te mutunga o Hepetema 1864.