atz feld ▁and ▁Count ▁of ▁G öt z ▁against ▁Sweden ▁and ▁helped ▁in ▁the ▁campaign ▁that ▁drove ▁the ▁Sw edes ▁under ▁the ▁command ▁of ▁Johan ▁Ban ér ▁back ▁to ▁the ▁Balt ic . ▁ ▁In ▁ 1 6 3 9 , ▁after ▁un ification ▁with ▁the ▁Bav ari ans ▁under ▁Franz ▁von ▁Mer cy , ▁the ▁Emperor ▁transferred ▁the ▁command ▁on ▁the ▁Rh ine ▁to ▁G le en . ▁He ▁crossed ▁the ▁Rh ine ▁near ▁Spe yer ▁in ▁October ▁that ▁year , ▁but ▁soon ▁had ▁to ▁rec ross ▁in ▁order ▁to ▁drive ▁the ▁enemy ▁from ▁the ▁R he ing au . ▁In ▁September ▁ 1 6 4 0 , ▁after ▁he ▁had ▁bes ie ged ▁and ▁occupied ▁B ingen , ▁he ▁combined ▁is ▁force ▁of ▁ 4 , 0 0 0 ▁inf antry ▁and ▁ 2 , 0 0 0 ▁caval ry ▁with ▁the ▁imperial ▁army ▁under ▁Leopold ▁Wilhelm ▁at ▁Fritz lar , ▁but ▁det ached ▁his ▁force ▁from ▁the ▁main ▁army , ▁to ▁bes ie ge ▁Fried berg , ▁and ▁then ▁winter ed ▁in ▁bishop rics ▁of ▁Wür zburg ▁and ▁B am berg ▁for ▁an ▁intended ▁invasion ▁of ▁Sweden ▁the ▁following ▁year . ▁ ▁In ▁early ▁ 1 6 4 1 , ▁he ▁helped ▁to ▁drive ▁Ban ér ▁from ▁the ▁Upper ▁Pal at inate ▁and ▁then ▁march ed ▁to ▁the ▁Rh ine ▁in ▁April , ▁where ▁he ▁spent ▁the ▁next ▁year ▁in ▁C ologne ▁under ▁H atz feld ▁on ▁an ▁inde cis ive ▁campaign ▁against ▁Gu éb ri ant . ▁So on