Tuhia he tomokanga mo tenei whitianga - I te pakanga a Grant ki Vicksburg, i whakahau a Logan i te wehenga tuatoru o te XVII Corps a James B. McPherson, ko ia te tuatahi i uru ki te taone o Vicksburg i te Hurae 1863 whai muri i tana hopu. I mahi a Logan hei kawana hōia o te taone. I te marama o Noema 1863 i whai mana ia ki a William Tecumseh Sherman i te rangatira o te XV Corps; a i te Pakanga o Atlanta
(Hōngongoi 22, 1864), i muri i te matenga o James B. McPherson i te awatea, i whakawhiwhia e ia te whakahau o te Army o Tennessee. I whakakorehia ia i muri tata mai i a Oliver O. Howard. I hoki ia ki Illinois mo nga pooti o te tau 1864 engari i uru ano ia ki te ope taua i muri mai ka whakahau i tana XV corps i te pakanga a Sherman Carolinas.