 Complete the following phrase:  Things were looking grim for Prussia now, with the Austrians mobilising to attack Prussian-controlled soil and a combined French and Reichsarmee army under Prince Soubise approaching from the west. The Reichsarmee was a collection of armies from the smaller German states that had banded together to heed the appeal of the Holy Roman Emperor Franz I of Austria against Frederick. However, in November and December 1757, the whole situation in Germany was reversed. First, Frederick devastated Soubises forces at the Battle of Rossbach on 5 November 1757 and then routed a vastly superior Austrian force at the 