Fleurus, a town of Hainaut, Belgium, near the left bank of the Sambre, 7 m. N. E. of Charleroi; pop. in 1866, 4,093. It has been the scene of four great battles. The first took place Aug. 29, 1622, between the Spaniards under Gonzales of Cordova and the army of the Protestant union under Christian of Brunswick and Count Mansfeld, the victory being claimed by both sides; the second, July 1,1690, between the French under Marshal Luxembourg and the Germans under the prince of Waldeck, the latter being defeated; the third, June 26, 1794, when the republican French general Jourdan defeated the imperialists under the prince of Coburg; and the fourth, generally known as the battle of Ligny, in which Blucher was worsted by Napoleon, June 16, 1815.