 Nyorai kupfuurira kweiyi ndima - Sweeny akaraira Illinois yeChipfumbamwe neChipiri paFort Donelson. PaShiro, achitungamirira boka revarwi, akabudirira kudzivirira mukaha mumutsetse weUnion. Akakuvadzwa muhondo agamuchira pfuti mbiri muruoko rwake bedzi rwakanga rwasara uye pfuti mune rimwe remakumbo ake. Sweeny akaramba ari pachinzvimbo ichi kusvikira hondo yapera, achiita kuti uto rose riyemure. Akadzokera kunotungamirira chikwata chake asi akadzokera kunotungamirira brigade apo General Pleasant A. Hackleman akaurayiwa paKorinde. Akatungamirira Chikamu Chechipiri cheSixteenth Army Corps mumushandirapamwe weAtlanta. Muhondo yeAtlanta, divi raSweeny rakatadzisa John B. Hood kurwisa. Sweeny akapinda mukurwa nemaoko nemutungamiriri wake, General Grenville M. Dodge, apo Dodge akatyora mutemo uye akatungamira pachake rimwe remapoka aSweeny panguva yekurwa. Sweeny akatongwa nedare rehondo nokuda kwezviito izvi asi akaregererwa. Akabuda muzvipiri muna August 1865, uye akadzingwa nokuda kwekuenda AWOL pakuguma kwegore. 