On his way back he had an interview at Port Royal with his sister, the Duchesse de Longueville, who, on hearing of her bereavement, gave way to long but silent grief; and, retiring from the world, passed her days in prayer and fasting for the repose of the soul of her dead son. Subsequently she became a devout Jansenist. Louis' ambitious plans to conquer Europe, frustrated for the moment, had now roused Spain, Denmark, and some of the German Princes to take up arms to prevent possible renewed attacks upon their territories; and two great soldiers came forward to keep guard upon the Rhine: William of Brandenburg (a hero himself and ancestor of heroes), and Montecucoli (so named after his feudal castle), who took the command of the Imperial troops. Condé, hardly yet recovered, was summoned by his sovereign, and was requested once more to operate in the Netherlands. William of Orange began by attacking the French army at Senef, and in spite of the "_fougue_" of Condé the battle remained undecided. Turenne, meanwhile, was manoeuvring on the Rhine against Montecucoli, who was marching on Alsace; he succeeded in repulsing the Imperial troops near the Neckar, taking Heidelberg and Mannheim, and forcing his way into the Palatinate. Suddenly, however, he had to change his tactics owing to the unexpected appearance of the Margrave of Brandenburg; and the French commander's plans terminated in a campaign in Alsace, where he was victorious at Mulhouse and Schletstadt. In that same year he was also confronted by Montecucoli, and unfortunately met his death at Salzbach before any decisive battle had been fought. His loss was a severe blow to his soldiers. Condé was immediately sent for; and, inspired by the memory of the dead general, followed his tactics, and succeeded without a single battle in driving the Imperial troops back across the Rhine. This was precisely what the King and his minister, Louvois, desired; for Montecucoli was thus shut out of Alsace, and obliged to take up his winter-quarters on the far side of the Rhine. By these brilliant operations Condé preserved Turenne's army, and terminated this great campaign, in which were engaged three of the most celebrated generals of the period: Montecucoli, the profound strategist, the sagacious Turenne, and the great Condé, who in the cause of France was always victorious.