Certainly he could urge in excuse that the British Government now insisted on the resumption of its favourite plan, the capture of that nest of privateers, Dunkirk. On receipt of the news of the surrender of Valenciennes, an order was sent to the Duke of York to begin the siege of that once important stronghold, and capture it for Great Britain, though it might be allowed finally to fall to the Emperor as one of his new Barrier fortresses, provided that we gained indemnities in other parts of the world. French and German historians, with their usual bias against Great Britain, have assumed that she had resolved to keep Dunkirk. The contrary is proved by the despatches of Dundas to Murray, and by a letter of Sir Gilbert Elliot whom Pitt appointed commissioner to regulate affairs at Dunkirk. Writing to Lady Elliot on 10th September Sir Gilbert says: "No further conquests are to be made in that quarter in the name of Great Britain, nor is it intended to retain Dunkirk after the peace."[230] A speedy capture of Dunkirk was evidently expected, for the same despatch ordered that the Hessian corps, some 8,000 strong, then with the Duke, must be held in readiness to depart to some other destination.[231] This referred either to the expedition in the Mediterranean (soon to be noticed) or to another, also in course of preparation, against Brittany. The Duke of York disapproved of the divergence towards Dunkirk, and the withdrawal of troops from his command.[232] We here touch upon the weak side of Pitt's war policy. His aims at first had been merely to defend England from invasion, and to use the fleet and as many troops as could well be spared, to threaten various points along the coast of France and to capture her colonies. From these comparatively simple aims he had been drawn aside into a continental campaign, owing to the desirability of re-establishing Austria firmly in the Pays Bas. That is to say, a political aim drew him away from the simple and effective plan of a maritime and colonial war. Or rather it would be more correct to say that he tried to carry on a limited continental campaign as well as the coast expeditions which promised to paralyse the activities of large numbers of Frenchmen.