Rubuta ci gaba ga wannan sakin layi - Shiga aikin soja na yakin basasa a lokacin rani na 1862, Buck ya shiga ranar 17 ga Agusta a Windsor, Connecticut, kuma an tattara shi a matsayin jami'in soja tare da Kamfanin A na 21st Connecticut Volunteer Infantry. Da farko an sanya shi ga Sojojin Tarayyar Potomac, shi da abokansa 21st Connecticut Volunteers sun yi yaƙi a yakin Fredericksburg daga Disamba 12 zuwa 15 na wannan shekarar. Yayinda yake aiki a "Mud March" na Burnside, an ba Buck girma zuwa matsayin dan jarida a ranar 20 ga Janairu, 1863. Shi da rundunarsa sun shiga cikin Siege na Suffolk a wannan bazara, mai kula da tsaro a kusa da Portsmouth da Newport News a lokacin rani, kaka da hunturu. Wani ɓangare na ƙungiyar ta Union tare da James River na Virginia, wanda aka kaddamar a ƙarshen Janairu 1864, 21st Connecticut Volunteers ya wuce ta Fort Powhatan da Smithfield kafin ya tafi Arewacin Carolina, inda suke aiki a New Bern (Fabrairu 12), Plymouth, Washington da Blount's Creek kafin ya koma Portsmouth, Virginia a ƙarshen Afrilu. An haɗa su da dakarun Union da ke shiga cikin ayyukan da aka yi wa Petersburg da Richmond don yawancin bazara da bazara, sun shiga cikin Swift Creek, Fort Darling, yakin Drewry's Bluff
, Bermuda Hundred, da Fadar White House kafin yin yaƙi a yaƙe-yaƙe kusa da Cold Harbor don yawancin watan Yuni da kuma yakin basasa a Bermuda Hundred daga ƙarshen Agusta zuwa ƙarshen Satumba 1864.