The French ministry did not entirely depend upon the fortune of the war for the execution of their revenge against king William, They likewise employed assassins to deprive him of life in the most treacherous manner.
When Louvois died, his son the marquis de Barbesieux, who succeeded him in his office of secretary, found among his papers the draft of a scheme for this purpose, and immediately revived the design by means of the chevalier de Grandval, a captain of dragoons in the service. He and colonel Parker engaged one Dumont, who undertook to assassinate king William. Madame de Maintenon, and Paparel, paymaster to the French army, were privy to the scheme, which they encouraged: the conspirators are said to have obtained an audience of king James, who approved of their undertaking, and assured them of his protection; but that unfortunate monarch was unjustly charged with the guilt of countenancing the intended murder, as they communicated nothing to him but an attempt to seize the person of the prince of Orange. Dumont actually enlisted in the confederate army, that he might have the better opportunity to shoot the king of England when he should ride out to visit the linos, while Grandval and Parker repaired to the French camp, with orders to Luxembourg to furnish them with a party of horse for the rescue of Dumont, after the blow should be struck. Whether this man’s heart failed him, or he could not find the opportunity he desired, after having resided some weeks in the camp of the allies, he retired to Hanover; but still corresponded with Grandval and Barbesieux. This last admitted one Leofdale, a Dutch baron, into the secret, and likewise imparted it to monsieur Chanlais, quarter-master general of the French army, who animated Grandval and Leefdale with the promise of a considerable reward, and promised to cooperate with Parker for bringing off Dumont, for this assassin still persisted in his undertaking. Leefdale had been sent from Holland on purpose to dive to the bottom of this conspiracy, in consequence of advice given by the British envoy at Hanover, where Dumont had dropped some hints that alarmed his suspicion. The Dutchman not only insinuated himself into the confidence of the conspirators, but likewise inveigled Grandval to Eyndhoven, where he was apprehended. Understanding that Dumont had already discovered the design to the duke of Zell, and that he himself had been betrayed by Leefdale, he freely confessed all the particulars without enduring the torture; and, being found guilty by a court-martial, was executed as a traitor.
About this period the duke of Leinster arrived at Ostend, with the troops which had been embarked at St. Helen’s. He was furnished with cannon sent down the Meuse from Maestricht, and reinforced by a large detachment from the king’s camp at Gramont, under the command of general Ptolemache. He took possession of Furnes, was joined by the earl of Portland and M. d’Auverquerque, and a disposition was made for investing Dunkirk; but on further deliberation the enterprise was thought very dangerous, and therefore laid aside. Furnes and Dixmuyde, lately reduced by brigadier Ramsay, were strengthened with new works, and secured by strong garrisons. The cannon were sent back, and the troops returning to Ostend, re-embarked for England. This fruitless expedition, added to the inglorious issue of the campaign, increased the ill humour of the British nation. They taxed William with having lain inactive at Gramont with an army of one hundred thousand men, while Luxembourg was posted at Courtray with half that number. They said, if he had found the French lines too strong to be forced, he might have passed the Scheld higher up, and not only laid the enemy’s conquests under contribution, but even marched into the bowels of France; and they complained that Furnes and Dixmuyde were not worth the sums expended in maintaining their garrisons. On the twenty-sixth day of September king William left the army under the command of the elector of Bavaria, and repaired to his house at Loo: in two days after his departure the camp at Gramont was broke up; the infantry marched to Marienkerke, and the horse; to Caure. On the sixteenth day of October, the king receiving intelligence that Boufflers had invested Charleroy, and Luxembourg taken post in the neighbourhood of Condé, ordered the troops to be instantly reassembled between the village of Ixells and Halle, with design to raise the siege, and repaired to Brussels, where he held a council of war, in which the proper measures were concerted. He then returned to Holland, leaving the command with the elector of Bavaria, who forthwith began his march for Charleroy. At his approach Boufflers abandoned the siege, and moved towards Philip-ville. The elector having reinforced the place, and thrown supplies into Aeth, distributed his forces into winter-quarters. Then Luxembourg, who had cantoned his army between Condé, Leuzet, and Tournay, returned to Paris, leaving Boufflers to command in his absence.