Early history

A fort was first erected at the site by the Spanish between 1584 and 1591 during the Eighty Years' War. The able Spanish general Alexander Farnese, Duke of Parma had captured Ypres and Veurne (Furnes). The fort was intended to block raiding parties of Dutch rebels coming from the port of Ostend. The successful Siege of Ostend removed the Dutch threat in 1604 and the fort fell into disuse. Spain awoke to the location's strategic importance during the Franco-Spanish War. In 1649 a new fort was constructed in the fork between the Yser River and the Ypres Canal.^[2]

France acquired the Castellany of Veurne-Ambacht by the Treaty of Aix-la-Chapelle in 1668. King Louis XIV of France wanted a double line of fortresses to protect the northern border of his kingdom. The fortifications expert Sébastien Le Prestre de Vauban immediately noted the importance of its location and set to work redesigning Fort de la Knocque in 1678. The core of the fort was a triangular island on the south side of the streams' confluence. A hornwork and ravelin with brick parapets protected the southeast side. The fort was expanded between 1690 and 1692 with the addition of two bastions, one on the north side and one on the south. Ravelins were added on the east and west sides, while three lunettes completed the defenses. All the new works were constructed of earth. Sometime between 1692 and 1712 a wide moat was added on the east and west sides.^[2]

Clash in 1695

Fort de la Knocque was attacked by the Grand Alliance during the Nine Years' War. In June 1695, the army of King William III of England was encamped at Aarsele between Tielt and Deinze. After detaching 11 squadrons of cavalry to join Maximilian II Emanuel, Elector of Bavaria's forces at Ninove, the army moved south on 10 June to threaten the French lines. French commander Marshal François de Neufville, duc de Villeroi put his defenses on alert at Veurne, Fort de la Knocque, Ypres and Menen (Menin).^[3]

On 19 June 1695 the Duke of Württemberg with 3,000 soldiers and supporting artillery advanced on Fort de la Knocque. A half-league from the fort was a French outpost on the Yser held by Count de la Mothe and over 400 dragoons. This post was attacked and, though reinforced, it was captured after a tenacious defense. At their newly seized bridgehead, the Allies built a temporary fort and armed it with two cannons. The French constructed a nearby counter-battery and numerous casualties were inflicted on both sides. The Allies tried to expand their bridgehead, but were thwarted by French counter-measures and cannon fire from Fort de la Knocque. After several days of skirmishing, the Allies withdrew on the night of 26–27 June.^[3]

It is assumed that the move against Fort de la Knocque was a feint attack, intended to distract the French from the Siege of Namur which followed in July. Even if the Allies had managed to widen their small bridgehead, they had to advance through a marsh which it would have been simple for the French to defend. However, the author felt that it was a serious attack and not a feint, because the British and their Dutch allies were particularly interested in seizing places along the Flanders coast.^[3]

Capture in 1712

Touraine Regt. 1734

In 1712 when the War of the Spanish Succession was turning against Habsburg Austria, Prince Eugene of Savoy cast about for a way for his shaken troops to gain a success. He heard that the garrison of Fort de Knocque was weak and its security was lax. Eugene called for a partisan named La Rue, told him his plan to surprise the garrison and instructed him to call on the governor of Ostend to give him whatever help he needed. At the same time Eugene alerted Lieutenant General Robert Murray at Lille to hold some troops ready to assist in the coup. La Rue's free company and some troops from Ostend stealthily took position in gardens near the fort where they caught and killed two sentries. La Rue disguised several of his men as peasants with their loaded weapons concealed in a cart. Appearing before the fort, they called out that they wanted to sell their wares to the officers and were admitted. The first group of partisans seized the door to the fort. After that, it was easy for a second disguised group to burst into the fort to find most of the officers and men inside their barracks. A few men raised the alarm but they were rapidly subdued at sword and bayonet point. When Murray arrived, he found the garrison prisoners of war. The general put a Dutch garrison into the fort and returned to Lille.^[4][5]

By the Treaty of Utrecht in 1713, France ceded control of Veurne-Ambacht to the Austrian Netherlands.^[2] By a unique arrangement, a line of fortresses in Austrian territory were handed over to the Dutch Republic to provide a barrier against future French invasions. From west to east, these were Veurne, Fort Knokke, Ypres, Menen, Tournai, Mons, Charleroi and Namur.^[6]

Siege of 1744

On 26 June 1744 during the War of the Austrian Succession the fort was assaulted by 18 picked French companies under the command of General Boufflers. Evidently the initial attack was a failure because on 28 June the French opened a siege trench on the west side of the fort. When they sapped close to the defenses, the French artillerists established one battery with four cannons and a second battery with four mortars. The fort capitulated to the French on 29 August 1744. The French employed units of the Piemont, Bourbonnais, Rohan, Royal, Touraine, Noailles, Orleans, La Couronne, Richecourt, Valenceau and du Roy Infantry Regiments. The cavalry contingent consisted of elements of the Egemont, La Suze and Mestre de Camp Cavalry Regiments and the Royal and Egemont Dragoons. The map depicting the siege called the fort La Kenoque. The central citadel within the junction of the streams is clearly visible. It is separated from the southern ramparts by a moat, making the citadel an island. There is a bastion on the west bank and another on the east bank. Both are covered by outworks.^[7]

Demolition

Fort de la Knocque was described as being located at the confluence of the Yser and Ieperlee at a distance of 1.5 leagues from Diksmuide, 3 leagues from Ypres and 4 leagues from both Veurne and Nieuwpoort (Nieuport). The fort was 750 by 500 feet (pieds) in extent and entry to the fort was through a narrow door. There were only a few casernes for the soldiers to live in, though the fort's commander had his own house and there was a chapel.^[8] After the mid-1700s, the fortifications lost much of their purpose. In 1781 Emperor Joseph II ordered Fort Knokke to be "slighted" or dismantled. The fort south of the junction of the Yser and Ypres Canal with its brick parapet was completely removed. The remainder of the raised defenses remain partly preserved amid modern pastureland.^[2]