Yaƙin na safiya ya faru a kowane gefen Chambersburg Pike, galibi akan McPherson Ridge.A kudu, manyan siffofi sune Willoughby Run da Herbst Woods (wani lokaci ana kiran McPherson Woods, amma sun kasance mallakar John Herbst).Brig.Brigade na Janar Lysander Cutler's Union sun yi adawa da brigade na Davis;uku daga cikin tsarin Cutler sun kasance arewacin Pike, biyu zuwa kudu.Zuwa hagu na Cutler, Brig.Janar Solomon Meredith's Brigade Iron Brigade ya yi adawa da Archer.^[8]Manjo Janar John Reynolds da brigades guda biyu na rundunar sojan farko na Union First Corps sun isa kuma su shiga layin tare da McPherson Ridge kan karuwar matsin lamba daga kusan 13,500 masu ci gaba da Confederates.Daya shine Brigade Iron, ɗayan kuma shine PA Bucktail Brigade.Janar Reynolds ya jagoranci brigades biyu zuwa matsayi kuma ya sanya bindigogi daga baturin Maine na Capt. James A. Hall inda Calef ya tsaya a baya.^[9] Yayin da Janar din ya hau dokinsa a gefen gabas na Herbst Woods, yana ihu "Maza gaba! Gaba saboda Allah, ku fitar da wadancan 'yan uwa daga cikin dazuzzuka," sai ya fado daga kan dokinsa, harsashi ya kashe shi nan take. a bayan kunne.(Wasu masana tarihi sun yi imanin cewa wani mai harbi ne ya sare Reynolds, amma ana iya cewa an kashe shi ta hanyar harbin bazuwar a cikin wata gobarar bindiga da aka kai a Wisconsin ta 2.) Manjo Janar Abner Doubleday ya zama shugaban rundunar I Corps.^[10]A gefen dama na layin Union, ƙungiyoyi uku na Brigade na Cutler sun kori Brigade na Davis kafin su iya shiga matsayi a kan tudu.Layin Davis ya mamaye hakkin Cutler's, yana mai da matsayin ƙungiyar ba zai yuwu ba, kuma Wadsworth ya umarci hukumomin Cutler su koma Seminary Ridge.An harbe kwamandan na 147th New York, Laftanar Kanal Francis C. Miller, kafin ya sanar da dakarunsa janyewar, kuma suka ci gaba da fafatawa cikin matsananciyar matsin lamba har sai da umarni na biyu ya zo.A cikin kasa da mintuna 30, kashi 45% na mutanen 1,007 na Janar Cutler sun sami raunuka, inda na 147 ya rasa 207 daga cikin jami'ai 380 da mazajensa.^[11] Wasu daga cikin mazajen Davis masu nasara sun juya zuwa ga wuraren Union a kudu da gadon jirgin kasa yayin da wasu suka tuka gabas zuwa Seminary Ridge.Wannan ya kawar da kokarin Confederate a arewacin pike.^[12]