The evening of 12 September strong French detachments had already reached the woods around
Bousbecque and Roncq (where they surprised an outpost of the Dutch regiment "Van Brakel," with a loss 40 men), positions. Informed about the attack, the Hereditary Prince asked Beaulieu personally to send reinforcements to the Dutch, who were already pressed by the French assault. Beaulieu refused, pleading that his troops had not yet had breakfast, and therefore could not be ready to march before 9 or 10 AM. He also informed the Prince that he had orders to support the British and not the Dutch. However, he detached four squadrons of cavalry (about 400 men) under general Kray to support Prince Frederick at Wervik, who with 5,000 Dutch troops was holding off a French attack of the division-Hédouville that had started at 5 AM. The village had changed hands twice already, before the French managed to occupy it in force, and drove the Dutch back with sustained artillery fire. of Flanders – the battlefield is in the middle of the triangle "Ipres"-Tournai-Courtrai (click for higher resolution and zoom) When general
Kray arrived at Wervik, he assured Prince Frederick that Beaulieu's main force would follow, and convinced the inexperienced Dutchman that it was safe to start a counterattack. The young Prince set himself at the head of the Dutch Guards, and supported by the Swiss regiment-De Gumoëns (in Dutch service) and two grenadier battalions, flanked by Dutch and Austrian cavalry, attacked a French battery head on. The Austrian cavalry troops were hit by heavy
grapeshot, and in confusion rode down the Dutch infantry, which also broke. At this crucial moment Prince Frederick was hit in the shoulder by a musket ball, and fell through loss of blood unconscious off his horse. Only with difficulty was he evacuated to a Dutch
field ambulance. This loss of the Dutch commander prompted so much confusion on the Allied side that a general retreat started, led by Frederick's second-in-command major-general Count Golowkin. The retreat was bravely covered by the Swiss, who held off pursuing French cavalry, but in the rearguard action the battalion of major Hohenlohe was destroyed with great loss of life. but lightly defended, town of Menen, thereby splitting the Dutch forces. When he heard this, general Golowkin, who had intended to occupy the town, decided to retreat further in the direction of
Roeselare. This forced the Hereditary Prince, still near Menen, to give up his defence also, and to retreat in the direction of
Kortrijk (Courtrai). In the evening he made a stand in a good position near Wevelgem. The next day the Hereditary Prince started the Dutch troops on an orderly strategic retreat (and therefore not in disarray, as some sources claim without any basis) toward
Ghent. On the way he met Beaulieu, who had the temerity to ask for some Dutch troops to cover Kortrijk. The Prince refused in a huff. According to De Bas the Hereditary Prince was much appreciated by the Dutch authorities (especially his father, the stadtholder and Captain-General of the States Army) for his decision to extricate the Dutch troops from Wervik and Menen, and retreat all the way to Ghent, thereby avoiding the destruction of the mobile army.
Digby Smith stated Dutch losses as 3,100 men and 40 guns out of a total of 13,000 infantry and 1,800 cavalry, while the French lost 1,500 men. ==Aftermath==