▁cities , ▁re - est ab lish ing ▁Imperial ▁authority ▁in ▁an ▁area ▁that ▁had ▁been ▁free ▁of ▁Imperial ▁rule ▁for ▁nearly ▁ 1 0 0 ▁years . ▁Ferdinand ' s ▁actions ▁were ▁not ▁well ▁received ▁by ▁the ▁princes . ▁It ▁was ▁a ▁move ▁that ▁al ar med ▁the ▁French ▁and ▁led ▁to ▁the ▁French ▁inter vention ▁in ▁the ▁war . ▁ ▁The ▁German ▁princes ▁could ▁do ▁nothing . ▁They ▁had ▁seen ▁the ▁Co al ition ▁destroyed . ▁W allen stein ▁had ▁a ▁massive ▁army ▁of ▁ 1 3 4 , 0 0 0 ▁troops ▁in ▁the ▁field ▁to ▁en force ▁Imperial ▁authority . ▁ ▁W allen stein ▁dis lik ed ▁the ▁Ed ict ▁as ▁it ▁tres pass ed ▁into ▁the ▁region ▁he ▁considered ▁his ▁own ▁but ▁he ▁played ▁his ▁part ▁for ▁the ▁em peror ▁to ▁the ▁full . ▁He ▁stated ▁that ▁" he ▁would ▁teach ▁the ▁Elect ors ▁man ners . ▁They ▁must ▁be ▁dependent ▁on ▁the ▁em peror , ▁not ▁the ▁em peror ▁on ▁them ." ▁ ▁The ▁response ▁of ▁the ▁princes ▁was ▁to ▁r ally ▁behind ▁Maxim ill ian ▁of ▁Bav aria ▁to ▁pressure ▁Ferdinand ▁into ▁dismiss ing ▁W allen stein . ▁ ▁Their ▁chance ▁came ▁in ▁ 1 6 3 0 ▁when ▁Ferdinand ▁called ▁a ▁meeting ▁of ▁the ▁Elect ors ▁in ▁Reg ens burg ▁because ▁he ▁wanted ▁his ▁son , ▁Ferdinand ▁III , ▁elected ▁King ▁of ▁the ▁Rom ans . ▁According ▁to ▁the ▁law , ▁the ▁em peror ▁of ▁the ▁Holy ▁Roman ▁Empire ▁was ▁selected ▁by ▁a ▁vote ▁from