The Battle of Fontenoy, 11 May 1745, was a major engagement of the War of the Austrian Succession, fought between the forces of the Pragmatic Allies – comprising mainly Dutch, British, and Hanoverian troops under the command of the Duke of Cumberland – and a French army under Maurice de Saxe, commander of King Louis XV's forces in the Low Countries. The battle is notable for several reasons. It was one of the most important in the war, and for the French a famous victory and the masterpiece of Marshal Saxe; the French Monarch Louis XV and his son the Dauphin were present on the field. Napoleon I later declared that the victory at Fontenoy prolonged the Ancien Régime monarchy in France by 30 years.

Saxe went on the offensive in April 1745 with a large French army, looking to build on the previous year's gains. His initial aim was to take control of the upper Scheldt basin and thereby gain access to the heart of the Austrian Netherlands. To these ends, he first pounced on the fortress of Tournai, protecting the siege with his main force about 5 miles (~9 km) south-east of the town. In order to relieve Tournai, the Allies first decided to attack Saxe's position – a naturally strong feature, hinged on the village of Fontenoy and further strengthened by defensive works. After failing to make progress on the flanks – the Dutch on the left, Brigadier Ingolsby's brigade on the right – Cumberland decided to smash his way through the centre without securing the flanks of his main attack. Despite devastating flanking fire the Allied column, made up of British and Hanoverian infantry, burst through the French lines to the point of victory. Only when Saxe concentrated all available infantry, cavalry, and artillery was the column forced to yield. The Allies retreated in good order, conducting a fighting withdrawal. The battle had shown, however, the strength of a defensive force relying on firepower and a strong reserve.