Ka rite ki te Union Army i raro i Major General William T. Sherman tīmata ki te ahu whakamua i roto i Georgia i Mei 1864, Georgia Kawana Hohepa E. Brown whakaritea Carswell he brigadier whānui i roto i te Georgia militia. I arahina e Carswell te 1st Brigade o te Georgia militia i te whakahee ki te Union Army i raro i Sherman i te Atlanta Campaign me Sherman's March to the Sea. I whawhai te piriti i te Pakanga o Ruff's Station, inaianei ko Smyrna, Georgia i te Hurae 4, 1864, te Pakanga o Atlanta
i te 22 o Hōngongoi 1864 me te wā o te whakapae o Atlanta tae noa ki te hinganga o te taone i te 2 o Hepetema 1864.