▁Cook ▁County ▁Company ▁F ▁- ▁Car roll ▁County ▁Company ▁G ▁- ▁Cook ▁County ▁( B ridge ' s ▁B atter y ) ▁Company ▁H ▁- ▁Rock ▁Island ▁County ▁Company ▁I ▁- ▁Cook ▁County ▁Company ▁K ▁- ▁Cook ▁County ▁( Ch icago ▁Z ou aves ) ▁ ▁Major ▁Camp aign s ▁and ▁batt les ▁The ▁ 1 9 th ▁Illinois ▁Vol unte er ▁Infantry ▁Regiment ▁served ▁at : ▁Ch att ano oga ▁- ▁At ▁Ch att ano oga , ▁it ▁was ▁described ▁to ▁have ▁been ▁the ▁most ▁strateg ic ▁city ▁to ▁capture . ▁Tennessee ▁ 1 8 6 2 ▁Alabama ▁ 1 8 6 2 ▁Mur fre es borough ▁Ch ick am agua ▁Atlanta ▁ ▁Service ▁The ▁ 1 9 th ▁Illinois ▁Infantry ▁was ▁organized ▁at ▁Chicago , ▁Illinois ▁and ▁must ered ▁into ▁federal ▁service ▁on ▁June ▁ 1 7 , ▁ 1 8 6 1 , ▁for ▁a ▁three - year ▁en list ment . ▁ ▁The ▁regiment ▁was ▁must ered ▁out ▁of ▁service ▁on ▁July ▁ 9 , ▁ 1 8 6 4 , ▁at ▁its ▁exp iration ▁of ▁en list ment . ▁ ▁Total ▁strength ▁and ▁cas ual ties ▁The ▁regiment ▁suffered ▁ 4 ▁officers ▁and ▁ 6 0 ▁en list ed ▁men ▁who ▁were ▁killed ▁in ▁action ▁or ▁who ▁died ▁of ▁their ▁w ounds ▁and ▁ 4 ▁officers ▁and ▁ 1 0 1 ▁en list ed ▁men ▁who ▁died ▁of ▁disease , ▁for ▁a ▁total ▁of ▁ 1 6 9 ▁fatal ities . ▁ ▁Command ers ▁Colonel ▁John ▁B .