Pedzisa mutsara unotevera: Pairwiwa Hondo yeWhite Oak Swamp muna June 1862, Lewis akarohwa gumbo rokurudyi nechidimbu chebhomba. Gare gare akapinda muhondo dzose dze5th Regiment kunze kwe
Mine Run uye Antietam kusvikira May 1864, apo ruoko rwake rworuboshwe rwakagurwa papfudzi somugumisiro wokukuvara kwaakatambura mukati mezuva rokutanga reHondo yeWilderness. Akabva aendeswa kuFredericksburg, ndokuzoendeswa kuBuffalo, uko mudzimai wake akamutarisira paaipora. MunaGunyana 1864, akaburitswa zvine rukudzo, uye akabatana neVeteran Reserve Corps (VRC) semakoronari; munaKurume 1865, akasimudzirwa kuita brigadier general.