But the French monarch was spared this last desperate alternative. The defection of the British Cabinet saved his throne, when all his means of defence were exhausted. Eugene, on opening the campaign on the 1st May, anxiously inquired of the Duke of Ormond whether he had authority to act vigorously in the campaign, and received an answer that he had the same authority as the Duke of Marlborough, and was prepared to join in attacking the enemy. Preparations were immediately made for forcing the enemy's lines, which covered Quesnoy, previous to an attack on that fortress. But, at the very time that this was going on, the work of perfidious defection was consummated. On May 10, Mr Secretary St John sent positive orders to Ormond to take no part in any general engagement, as the questions at issue between the contending parties were on the point of adjustment.[18] Intimation of this secret order was sent to the Court of France, but it was directed to be kept a positive secret from the Allied generals. Ormond, upon the receipt of these orders, opened a private correspondence with Villars, informing him that their troops were no longer enemies, and that the future movements of the troops under his command were only to get forage and provisions. This correspondence was unknown to Eugene; but circumstances soon brought the defection of England to light. In the middle of it, the Allied forces had passed the Scheldt, and taken post between Noyeller and the Boiase, close to Villars's position. To bring the sincerity of the English to a test, Eugene proposed a general attack on the enemy's line, which was open and exposed, on the 28th May. _But Ormond declined_, requesting the operation might be delayed for a few days. The defection was now apparent, and the Dutch deputies loudly condemned such dishonorable conduct; but Eugene, anxious to make the most of the presence of the British troops, though their co-operation could no longer be relied on, proposed to besiege Quesnoy, which was laid open by Villars's retreat. Ormond, who felt acutely the painful and discreditable situation in which, without any fault of his own, he was placed, could not refuse, and the investment took place that very day. The operations were conducted by _the Dutch and Imperial troops alone_; and the town was taken, after a siege of six weeks, on the 10th July.[19]