It speaks volumes for the confidence inspired by Pitt and Grenville, and for the tactful zeal of Malmesbury and Eden, that they induced the German rivals to make one more effort. The Duke of York also played an important part in the formation of the plan of campaign; for he it was who persuaded Colonel Mack to accompany him to London, and there discuss with Ministers the alternative schemes. The mention of Mack will excite surprise among those who know of him only by the futile Neapolitan campaign of 1799, and the frightful disaster of Ulm. In regard to strategy and the theory of war he displayed much ability; and his administrative talents and energy as Quarter-Master-General in 1793 should have screened him from the criticism that he discoursed brilliantly on war in _salons_, and in the council rhetorically developed specious and elegant plans.[345] Mack's plan of operations was first submitted to the judgement of the Archduke Charles, the Prince of Coburg, Count Mercy, the Prince of Orange, and the Duke of York, at Brussels. Next, he proceeded, along with Counts Stahremberg and Merveldt to London, and on 13th February unfolded his plan to Pitt, Grenville, and Dundas. The Duke of York had preceded him by two days, but was absent from this conference. It became piquant when Pitt "playfully" remarked to Mack that a great general had recently arrived at London whose appointment to the command of the British force in Flanders would doubtless meet with his warm approval. After a little more fencing, Pitt gave the name of the Marquis Cornwallis, who had just returned from his Viceroyalty in India. Mack by no means welcomed the proposal, and made the irreverent remark that the best General, after fighting elephants in India, would be puzzled by the French. Pitt thereupon observed that the Duke of York had not the confidence of the army, to which Mack and Merveldt replied by praising his character, and decrying his critics as a set of influential but inexperienced youths.