 Complete the following phrase:  Now the Bavarians retreated to Würzburg while the Prussians turned westward against the VIIIth Corps which protected Frankfurt. The Prussians crossed the Spessart, defeated the Hessians at a hrefLaufachLaufachFrohnhofena on 13 July and the Austrian and Hessian troops at Aschaffenburg on 14 July. The Federal troops had to withdraw westward to the left bank of the Main. After the Prussians had conquered Aschaffenburg and crossed the Main the way to Frankfurt and Darmstadt was open. Now the VIIIth Corps abandoned Frankfurt, moved south across the Odenwald and then turned eastward to meet the Bavarians at the river Tauber. The Prussians occupied the now undefended Frankfurt on 16 July and then followed the VIIIth Corps along the left bank of the Main. In the combat of Hundheim 23 July, the battles of Werbach, 