An incident which did much to bring on the crisis which was felt to be imminent on all sides was the desertion to the Russians of the Prussian corps under General York. In the retreat from Russia, York was in command of Macdonald’s rear-guard. The Marshal, leading the centre, duly arrived at Tilsit, opened communications with Königsberg, and waited for York. At first Macdonald thought that the Prussian General had met with misfortune on the road, then rumour whispered of treachery, and finally an officer who had been testing the ice on the river informed him that he had seen the Prussians rapidly re-cross the Niemen. “Good Heavens!” Macdonald exclaimed as the full force of the blow became apparent to him, “we are betrayed--perhaps given up; but we will sell our lives dearly.” His feeble forces, however, made their way through the dense forest of Bömwald, and after a sharp skirmish at Labiau, reached Königsberg. From thence they marched to Elbing, crossed the frozen Vistula, and were soon within sight of the fortress of Danzig. Here Macdonald handed over his command to General Rapp, the Governor, and shortly afterwards was recalled to Paris to assist in the organisation of new army corps. During an interview the Emperor frankly admitted that he had been misled as to Prussia’s policy, and that the campaign they were about to undertake would be “the last.” “He added,” says Macdonald, “that he put implicit trust in his father-in-law, the Emperor of Austria. ‘Beware!’ I answered. ‘Do not trust the clever policy of that Cabinet.’” There was considerable justification for this remark; the Austrian contingents had played but a half-hearted part in the Russian campaign. What York had done was to take matters into his own hands and come to terms with the Russians because he feared for the safety of his troops. Diebitsch, the commander who suggested a conference, really played a very good game of bluff. He had told York that he was intercepted, whereas the Prussian forces were over seven times as strong as his own! However, they arranged that the district around Memel and Tilsit should be neutral territory until the Prussian monarch’s decision should be received. “Strictly considered,” says Dr J. Holland Rose, “this Convention was a grave breach of international law and an act of treachery towards Napoleon. The King at first viewed it in that light; but to all his subjects it seemed a noble and patriotic action. To continue the war with Russia for the benefit of Napoleon would have been an act of political suicide.”