▁Confeder ates ▁saw ▁the ▁Union ▁soldiers ▁withdraw ing , ▁they ▁renew ed ▁their ▁attacks , ▁threaten ing ▁to ▁surr ound ▁Johnson ' s ▁and ▁B air d ' s ▁divisions . ▁Although ▁Johnson ' s ▁division ▁managed ▁to ▁escape ▁relatively ▁un sc athed , ▁B air d ▁lost ▁a ▁significant ▁number ▁of ▁men ▁as ▁prisoners . ▁Thomas ▁left ▁H ors es ho e ▁R idge , ▁placing ▁Gr anger ▁in ▁charge , ▁but ▁Gr anger ▁depart ed ▁soon ▁there after , ▁leaving ▁no ▁one ▁to ▁coordinate ▁the ▁withdraw al . ▁Ste ed man , ▁Bran nan , ▁and ▁Wood ▁managed ▁to ▁ste alth ily ▁withdraw ▁their ▁divisions ▁to ▁the ▁north . ▁Three ▁reg iments ▁that ▁had ▁been ▁attached ▁from ▁other ▁units — the ▁ 2 2 nd ▁Michigan , ▁the ▁ 8 9 th ▁Ohio , ▁and ▁the ▁ 2 1 st ▁Ohio — w ere ▁left ▁behind ▁without ▁sufficient ▁am mun ition , ▁and ▁ordered ▁to ▁use ▁their ▁bay on ets . ▁They ▁held ▁their ▁position ▁until ▁surrounded ▁by ▁Pr eston ' s ▁division , ▁when ▁they ▁were ▁forced ▁to ▁surrender . ▁ ▁After math ▁ ▁Thomas ▁with d rew ▁the ▁remainder ▁of ▁his ▁units ▁to ▁positions ▁around ▁Ross ville ▁G ap ▁after ▁darkness ▁fell . ▁His ▁personal ▁determ ination ▁to ▁maintain ▁the ▁Union ▁position ▁until ▁ordered ▁to ▁withdraw ▁while ▁his ▁commander ▁and ▁pe ers ▁fled ▁earned ▁him ▁the ▁nick name ▁Rock ▁of ▁Ch ick am aug a , ▁derived ▁from ▁a ▁portion ▁of ▁a ▁message ▁that ▁Gar field ▁sent ▁to ▁Rose