 Rosecrans akavamba Chickamauga Campaign mukupera kwaAugust, achironga kuratidzira pedyo neChattanooga uye kumusoro kweguta pedyo neRwizi rweTennessee. Izvi zvakagutsa Bragg kuti Rosecrans akanga achiyambuka rwizi kuchamhembe; zvisinei, mauto eUnion akanga achiyambuka kumaodzanyemba kweguta. Izvi zvakamanikidza Bragg kuti adzokere kuchamhembe kweGeorgia, achisiya nzvimbo inokosha yezvitima yeChattanooga musi waSeptember 8. Kwemazuva anoverengeka akatevera, Bragg akaedza kurwisa kakawanda zvikamu zveuto reUnion asi kuedza kwose kwakakundikana. Manheru aSeptember 18, Bragg akaunganidza mauto pedyo neChickamauga Creek; akafunga kuti chikamu chete cheuto reUnion chaiva pedyo asi Rosecrans akanga aunganidza mauto ake nokukurumidza kupfuura Bragg akanga atarisira. Musi waSeptember 19 paChickamauga, mativi ose ari maviri akapinza zvombo sezvo zuva rakafambira mberi. Longstreet akasvika panhandare yehondo husiku hwa19 na20; Bragg akakamura mauto kuita mapapiro maviri, naPolk achiraira rimwe divi reuto rake pamwe chete neHills uye Walkers corps kurudyi, uye Longstreet achiraira rimwe divi rePolks corps neBuckners corps uye yake yega corps inotungamirwa naJohn B. Hood, kuruboshwe. Polk akarayirwa kuti arwise masikati musi wa20 Gunyana, Longstreet achirwisa pakarepo, asi Polk haana kutanga kurwisa kwake kusvika pakati pemangwanani. Mapapiro ekuruboshwe akakundikana kudzinga mauto eUnion asi bapiro raLongstreet rakarwisa mukaha muuto reUnion iro rakadzinga divi rekurudyi reUnion. Chikamu cheuto reUnion chakaungana paHorseshoe Ridge ndokubata kurwisa kwakawanda kweConfederate kusvika manheru, pavakatevera vamwe vese veuto raRosecrans kupinda muChattanooga. 