A o leʻi tuua e Coyne ma lana vaega le nofoaga na latou nonofo ai i le tau mālūlū i le amataga o le tautotogo o le 1864, na toe tofia ai loa i latou i le 2nd Brigade, 4th Division of the U.S. Army's II Corps mai ia Mati e oo ia Me, ona toe tofia ai lea i le 4th Brigade, 3rd Division i totonu o le vaega lava lea e tasi. Na faatonuina i tiute e fesootaʻi ma le Lieutenant-General Ulysses S. Grant's Overland Campaign (Me 4 <unk> Iuni 24, 1864), ona latou tau lea i taua o le Wilderness (Me 5<unk>7), Spotsylvania Court House (Me 8<unk>21), North Anna (Me 23<unk>26), Totopotomoy Creek
(Me 28<unk>30), ma Cold Harbor (Me 31 <unk> Iuni 12), ma auai i le Siege of Petersburg mai ia Iuni 9 seʻia oʻo ia Iuni 22 ina ua toe faʻafoʻi atu le regiment i Niu Ioka mo le faʻaputuputuina ma le toe faʻatulagaina. E ui lava o le toʻatele o le 70th New York infantrymen na mulimuli ane toe faʻaaogaina i le 86th New York Infantry, ae na faʻaaloalogia Coyne i le Aai o Niu Ioka ia Iulai 1, 1864.