Siege of Lille (1708)

The Siege of Lille (12 August – 10 December 1708) was the salient operation of the 1708 campaign season during the War of the Spanish Succession. After an obstinate defence of 120 days, the French garrison surrendered the city and citadel of Lille, commanded by Marshal Boufflers, to the forces of the Duke of Marlborough and Prince Eugene.

The siege was famous among contemporaries for l'affaire des poudres ("the gunpowder incident"), where the Chevalier de Luxembourg with 2,000 horsemen passed through the Allied lines and succeeded in delivering 40,000 pounds of desperately needed gunpowder to the defenders.

The siege was made possible by the destruction of the French army at the Battle of Oudenarde and the landing in Ostend of large amounts of ammunition and food after the Battle of Wijnendale. For most of the campaign, Eugene commanded the forces besieging Lille, while Marlborough commanded the forces covering those forces against external French interference. For a short period in late September however, after Eugene was injured on the 21st, Marlborough took command of both the besiegers and the covering force.

On 22 October the Allies entered the city at the staggering cost of 12,000 casualties; Boufflers continued to resist from Lille's citadel for several weeks, exacting an additional 4,000 allied casualties. While the allies' deft manoeuvring frustrated French attempts to relieve their precious fortress—the last substantial French bastion in northern Flanders—Boufflers' valiant defence likewise prolonged the siege well into winter, to the point where no operations could be undertaken against France that year. The French defenders of Lille withdrew with full honours of war.

With the loss of Lille, the French presence in northern Flanders crumbled; the Allies moved against Ghent, taking the city in late December. However, an invasion of France the following summer along the corridor opened by the fall of Lille would run into a bloody standstill at the Battle of Malplaquet.