▁May ▁ 2 , ▁ 1 8 6 1 , ▁the ▁Illinois ▁State ▁Legisl ature ▁author ized ▁the ▁" accept ance ▁for ▁State ▁service ▁of ▁ten ▁reg iments ▁of ▁inf antry ," ▁one ▁caval ry ▁regiment ▁and ▁one ▁light ▁art illery ▁batt alion . ▁The ▁act ▁provided ▁that ▁" one ▁such ▁reg iments ▁be ▁raised ▁out ▁of ▁volunte er ▁companies ▁then ▁at ▁Spring field , ▁as ▁the ▁regiment ▁from ▁the ▁state ▁at ▁large , ▁and ▁one ▁regiment ▁from ▁each ▁of ▁the ▁nine ▁con gression al ▁districts ." ▁ ▁On ▁May ▁ 4 , ▁ 1 8 6 1 , ▁the ▁regiment ▁from ▁the ▁State ▁at ▁large ▁was ▁must ered ▁into ▁service ▁at ▁Camp ▁Y ates . ▁By ▁June ▁ 3 , ▁it ▁was ▁ordered ▁to ▁Chicago ▁where ▁it ▁became ▁the ▁core ▁of ▁the ▁regiment . ▁It ▁was ▁eventually ▁must ered ▁into ▁United ▁States ▁service ▁for ▁three ▁years ▁and ▁on ▁June ▁ 1 7 , ▁ 1 8 6 1 , ▁it ▁became ▁the ▁ 1 9 th ▁Illinois ▁Vol unte er ▁Infantry ▁Regiment . ▁The ▁nin ete enth ▁has ▁been ▁rever ed ▁as ▁" a ▁solid ▁and ▁expert ▁Z ou ave ▁regiment " ▁which , ▁until ▁the ▁battle ▁of ▁Ch ick am aug a ▁was ▁remembered ▁for ▁its ▁charge ▁at ▁Stone ' s ▁River . ▁ ▁Comp an ies ▁and ▁Count ies ▁Company ▁A ▁- ▁Cook ▁County ▁( Ch icago ▁Z ou aves ) ▁Company ▁B ▁- ▁St ark ▁County ▁Company ▁C ▁- ▁Lake ▁County ▁Company ▁D ▁- ▁Cook ▁County ▁Company ▁E ▁-