In 1793 and 1794, Josias commanded the army in the Austrian Netherlands during the Flanders Campaign. Because of his victories in the French Revolutionary Wars (in the Battle of Neerwinden (1793) and the Battle of Aldenhoven (1794)), he returned the region to Austrian control. Entering France, he took Condé, Valenciennes, Quesnoy and Landrecies. However, due to poor positioning he suffered a string of minor setbacks. This poor positioning was caused by disunity amongst the Allied powers and their forces. His army than suffered a decisive defeat at the Battle of Fleurus (26 June). 