The following year was threatening for Charles. The Sultan was advancing in force upon Vienna. Barbarossa after devastating the coasts of Italy joined the French fleet under the Duke of Enghien, and laid siege to Nice (August 5, 1543). The city surrendered before long; but the citadel held out, until it was relieved by the approach of del Guasto by land and of Andrea Doria by sea (September 8). Barbarossa returned to winter at Toulon, where throughout the winter Christian slaves were openly sold. Francis on his part invaded Hainault. But Charles, leaving Barcelona for Genoa with the fleet of Doria, arrived in Italy (May, 1543), and, after a hurried interview with the Pope, whose desire for Milan or Siena he was not able to content, continued his journey towards Germany, with a small force of Spaniards and Italians. The Council, already summoned (1542) to Trent, had to be postponed; other things for the moment were more pressing. Ferdinand was left to manage as best he could in the East. At Speier Charles picked up a considerable force of Germans who had assembled to bring aid against the Turks. But Charles led them on with him to Cleves, and attacked Duren. In two days the city was captured by assault. In a fortnight the Duke was at his feet imploring pardon, and on September 7, 1543, a treaty was signed by which the Duke broke off" all alliance with France, Denmark, and Sweden, and ceded the duchy of Gelders with the county of Zutphen.
This success fully compensated for the reoccupation of Luxemburg by the French which was completed about the middle of September. Charles moved into Hainault to effect a juncture with the troops which Henry, his ally in this war as he had been in his first, had sent to Calais, and advanced (October 20) to the siege of Landrecies. Francis was in the neighbourhood with a superior army; Charles was anxious to meet him in the field, and advanced in hopes of tempting him to battle. In this he did not succeed, but the retreat of the French army left him with the honours of the campaign.
But the war was not over, and Charles needed all the aid that could be by any means procured. Henry was induced to promise to invade France in the coming spring with an army of 35, 000 men. Peace was made with Christian III of Denmark. At the Diet of Speier, 1544, Charles met the German Princes and by extensive concessions secured the neutrality or support of the Protestant Estates. François, Count d'Enghien, had invaded Italy, and advanced to recover Carignano near Ti^rin, which del Guasto had occupied. Del Guasto hurried from Milan to relieve it; and d'Enghien, having received permission to risk a battle, attacked him at Ceresole on April 14, 1544, and completely defeated him, with the loss of some 8000 killed and 2000 prisoners. All Italy began to consider the division of the spoil, but their hopes were vain. The Spanish, holding all the strong places of Lombardy, were enabled to prevent d'Enghien from any further success. Piero Strozzi,
