On July 15th, shortly after the Third Conquest War began, France had already mobilized its army, and the next day, the French parliament voted to officially declare war on Prussia.
Following closely, the four Southern German states (Bavaria, Baden, Württemberg, Hesse) with rising nationalist sentiments completely sided with Prussia.
Prussia currently has three corps, with the southern part mainly led by Crown Prince Friedrich William (Frederick III) commanding the Third Corps, which comprises:
5th Army: Commander Kilchbach
6th Army: Commander Tumpelinger
11th Army: Commander Boze
Bavarian 1st Army: Commander Tann-Ratshamhausen
Bavarian 2nd Army: Commander Hartman
Wurttemberg Division,
Baden Division,
2nd and 4th Cavalry Divisions
Heixinggen Brigade.
Due to the unique status of the Heixinggen principality, it is categorized as an independent military unit, theoretically on par with the Prussian army.