For the moment the Emperor was safe. The year was too far advanced to permit of a combined movement upon Vienna. But it was clear to all parties that the attempt would be made in the next campaign. It seemed equally certain that if made it must succeed, unless Marlborough and the army of the Netherlands could come to the rescue. Louis made great preparations for the effort. Villars, whose arrogance was displeasing to the elector, was recalled and sent to the Cevennes, where the remnants of the Huguenots had risen under the name of the Camisards. His place was taken by Marsin, and his army strongly reinforced. The plan of campaign was simple. Marsin and the elector were to march straight upon Vienna down the Danube, while Ragotsky attacked the city from the side of Hungary. Tallard, at the head of 35,000 men, was posted in Alsace to support the movement, preserve the communications, and defend the army from any flank attack. Villeroy, with 30,000 men, was sent to the Netherlands to keep Marlborough at bay and prevent him from coming to the rescue. Against this overwhelming force Austria could only oppose the armies of prince Louis of Baden, and prince Eugene. If the Emperor was to be saved, it must be by Marlborough, and how could Marlborough leave the Netherlands without throwing open the United Provinces to invasion? Was it likely that the Dutch would endanger their own safety for the sake of the Emperor? Even if they did, was it possible to escape the combined attack of the armies of Tallard and Marsin and the elector when the Danube was reached? [Sidenote: =Plan of Marlborough.=]