The Battle of Fleurus, on 26 June 1794, was an engagement during the War of the First Coalition, between the army of the First French Republic, under General Jean-Baptiste Jourdan, and the Coalition army, commanded by Prince Josias of Coburg, in the most significant battle of the Flanders Campaign in the Low Countries during the French Revolutionary Wars. Both sides had forces in the area of around 80,000 men but the French were able to concentrate their troops and defeat the First Coalition. The Allied defeat led to the permanent loss of the Austrian Netherlands and to the destruction of the Dutch Republic. The battle marked a turning point for the French army, which remained ascendant for the rest of the War of the First Coalition.

The Battle of Lambusart saw a Republican French army led by Jean Baptiste Jourdan try to cross the Sambre River against a combined Dutch and Habsburg Austrian army under William V, Hereditary Prince of Orange. This battle was the culmination of the fourth of five attempts to consolidate a foothold on the north side of the Sambre. The clash occurred during the War of the First Coalition, part of a wider struggle known as the Wars of the French Revolution. In 1794, Lambusart was an independent village, but it is now part of the Fleurus municipality. Lambusart is located about 10 kilometres (6 mi) northeast of Charleroi.