The other French army commanded by Marshal Louis Charles d'Estrées consisted of about 50,000 infantry, 10,000 cavalry and 68 cannons. The army advanced towards the Electorate of Hanover. Prussia was heavily involved with its enemies Austria, Russia and Sweden and therefore was not able to help on the western front. This task was given to the Hanoverian Army of Observation which had little support from Prussia, namely six Prussian battalions. The main part of the "Hanoverian Army of Observation" came from Hanover (about 60%) and Hesse (about 25%), smaller additional forces from Brunswick and Prussia. The total strength of the Hanoverian Army of Observation consisted of about 30,000 infantry, 5,000 cavalry and 28 guns. The army was commanded by William Augustus the Duke of Cumberland who was a son of King George II of Great Britain.