The Battle of Grand-Reng or Battle of Rouvroi saw a Republican French army jointly commanded by Louis Charbonnier and Jacques Desjardin attempt to advance across the Sambre River against a combined Habsburg Austrian and Dutch army under Franz Wenzel, Graf von Kaunitz-Rietberg. After winning crossings over the Sambre at Thuin and Lobbes on the 10th and Merbes-le-Château on the 12th, the French were defeated on 13 May at Grand-Reng and forced to retreat. The War of the First Coalition engagement marked the first of five attempts by the French armies to establish themselves on the north bank of the Sambre. Grand-Reng is now part of the village of Erquelinnes, Belgium, lying close to the border with France. Rouveroy (Rouvroi) is situated 3.8 kilometres (2.4 mi) north. Grand-Reng is located about 33 kilometres (21 mi) southwest of Charleroi.

Louis Charbonnier was a general of mediocre talent who commanded a French army for several months during the French Revolutionary Wars. In 1780 he enlisted in the French Royal Army. With the advent of the French Revolution his promotion became very rapid. In 1792 he was elected second in command of a volunteer battalion. He led his troops at Jemappes and Neerwinden. He was promoted to general of brigade in November 1793 and general of division in January 1794. A week later he was appointed commander-in-chief of the Army of the Ardennes.