That general had, now and for ever, separated his troops from the French. Upon 30th December, he had concluded an armistice with the Russian general, Dibbeitsch. By this agreement, the Prussian troops were to be cantoned in their own territories, and remain neutral for two months; at the end of that period, if their king so determined, they should be at liberty to rejoin the French troops. Both D'Yorck and Massenbach wrote to Macdonald, announcing their secession from his army. D'Yorck contented himself with stating, that he cared not what opinion the world might form on his conduct, it was dictated by the purest motives--his duty to his troops and to his country. Massenbach expressed his respect and esteem for General Macdonald, and declared, that his reason for leaving him without an interview, was the fear he felt that his personal regard for the Maréchal might have prevented his obeying the call of duty. Thus did a Prussian general first set the example of deserting the cause in which he served so unwillingly--an example which soon spread fast and far. It was a choice of difficulties on D'Yorck's side, for his zeal as a patriot was in some degree placed in opposition to the usual ideas of soldierly honour. But he had not left Macdonald till the Maréchal's safety, and that of the remainder of his army, was in some measure provided for. He was out of the Russian territory, and free, or nearly so, from Russian pursuit. D'Yorck had become neutral, but not the enemy or his late commander. Here the question arises, how long were the Prussians to be held bound to sacrifice their blood for the foreigners, by whom they had been conquered, pillaged, and oppressed; and to what extent were they bound to endure adversity for those who had uniformly trampled on them during their prosperity? One thing, we believe, we may affirm with certainty, namely, that D'Yorck acted entirely on his own responsibility, and without any encouragement, direct or indirect, from his sovereign. Nay, there is room to suppose, that though the armistice of Taurogen was afterwards declared good service by the King of Prussia, yet D'Yorck was not entirely forgiven by his prince for having entered into it. It was one of the numerous cases, in which a subject's departing from the letter of the sovereign's command, although for that sovereign's more effectual service, is still a line of conduct less grateful than implicit obedience. Upon receiving the news, Frederick disavowed the conduct of his general, and appointed Massenbach and him to be sent to Berlin for trial. But the officers retained their authority, for the Prussian army and people considered their sovereign as acting under the restraint of the French troops under Augereau, who then occupied his capital. Macdonald, with the remains of his army, reduced to about 9000 men, accomplished his retreat to Königsberg after a sharp skirmish. [Sidenote: CLOSE OF THE RUSSIAN EXPEDITION.]