Nevertheless, from the moment when Thugut was called to power the alliance between Austria and Prussia was doomed. Others might perhaps have averted a rupture; Thugut made no attempt to do so. The siege of Mainz was the last serious operation of war which the Prussian army performed. The mission of an Austrian envoy, Lehrbach, to the Prussian camp in August, 1793, and his negotiations on the Polish and the Bavarian questions, only widened the breach between the two Courts. It was known that the Austrians were encouraging the Polish Diet to refuse the cession of the provinces occupied by Prussia; and the advisers of King Frederick William in consequence recommended him to quit the Rhine, and to place himself at the head of an army in Poland. At the headquarters of the Allies, between Mainz and the Alsatian frontier, all was dissension and intrigue. The impetuosity of the Austrian general, Wurmser, who advanced upon Alsace without consulting the King, was construed as a studied insult. On the 29th of September, after informing the allied Courts that Prussia would henceforth take only a subordinate part in the war, King Frederick William quitted the army, leaving orders with the Duke of Brunswick to fight no great battle. It was in vain that Wurmser stormed the lines of Weissenburg (Oct. 13), and victoriously pushed forward into Alsace. The hopes of a Royalist insurrection in Strasburg proved illusory. The German sympathies shown by a portion of the upper and middle classes of Alsace only brought down upon them a bloody vengeance at the hands of St. Just, commissioner of the Convention. The peasantry, partly from hatred of the feudal burdens of the old _régime_, partly from fear of St. Just and the guillotine, thronged to the French camp. In place of the beaten generals came Hoche and Pichegru: Hoche, lately a common soldier in the Guards, earning by a humble industry little sums for the purchase of books, now, at the age of twenty-six, a commander more than a match for the wrangling veterans of Germany; Pichegru, six years older, also a man sprung from the people, once a teacher in the military school of Brienne, afterwards a private of artillery in the American War. A series of harassing encounters took place during December. At length, with St. Just cheering on the Alsatian peasants in the hottest of the fire, these generals victoriously carried the Austrian positions at Wörth and at Weissenburg (Dec. 23, 26). The Austrian commander declared his army to be utterly ruined; and Brunswick, who had abstained from rendering his ally any real assistance, found himself a second time back upon the Rhine. [34] [Pitt's bargain with Prussia, April, 1794.] [Revolt of Kosciusko. April, 1794.] [Möllendorf refuses to help in Flanders.]