Napoleon, in his memoirs of the campaigns of the great European generals, gave a high place to the battle of Leuthen, pronounced it a masterpiece, and declared it of itself sufficient to fix Frederick in the foremost rank of generalship. During this memorable year, the envoy frequently attended the headquarters, and shared not merely the privations but the dangers of the campaign. Of this period he kept a diary, containing the more remarkable particulars, and giving a curious picture of the harassing life, even of the highest rank, once engaged in war. But of this service there was soon to be an interruption. The Hanoverian Convention had soured the King of Prussia's mind against the English cabinet: the failure of the expedition against Rochfort--a failure, however, which arose simply from a precipitate embarkation, (for the English troops had, until that moment, driven everything before them)--and the delay of sending a fleet to the Baltic, were topics of irritation at the Prussian court, which, of course, were first visited on the head of the envoy, and which, in turn, he visited (with whatever reserve) on the head of the British cabinet. But Chatham had then succeeded to the direction of affairs, and he was not a man to take remonstrance patiently. The immediate result was the mission of Yorke to Berlin, and the recall of Mitchell. But another change in the public councils made Yorke's mission only temporary, and Mitchell was ordered to remain "until further orders." The brilliant successes of Rosbach and Leuthen had raised the King's military name to the highest rank, but they only increased the number of his enemies. The Russians, fresh in the field, admirably equipped for the campaign, and longing to gather German laurels, had poured down upon his army, exhausted as it was by incessant fighting, and almost hopeless of seeing an end to the war, but still proud of their reputation, and confident in their King. A letter from the envoy to Lord Holdernesse gives an animated though brief account of their first collision. "FIELD OF BATTLE, ZORNDORF, _26th August 1753_. "My Lord,--I have the satisfaction to acquaint your Lordship, that yesterday, after an action which lasted _ten hours_, the King of Prussia has gained a victory over the Russian army, taken many pieces of cannon, and many colours and standards.