Napoleon was not impatient. He had already told Davout that he should not commence operations until the grass had grown in order that he might therewith supplement his stores of forage; and he did not leave Dresden until the 30th of May. On that day the whole army was concentrated between Königsberg and Warsaw; the 2nd, 3rd, 4th and 6th Corps were all in line, and the Guard was collecting at Posen. Napoleon in his orders for the advance on the Niemen, on May 26th, contemplates the army as three masses: the right, consisting of the 5th, 7th and 8th Corps, under Jerome; the centre, of the 4th and 6th, under Eugène; and the left, of the Guard, the 1st, 2nd and 3rd, and the new 10th Corps (Davout’s foreign division and the Prussians) which he would conduct in person. Two Reserve Cavalry Corps were allotted to the left, one to the centre, and one to the right. Meanwhile, on the Russian side, the Emperor Alexander had arrived at Vilna on April 26th. As Emperor he nominally had the chief command, but unfortunately his motley following of German princes and relatives, military adventurers and theorists, had much more to suggest than the harassed sovereign, who must at times have been almost in despair at being called upon to decide between them. There were lengthy discussions and much drafting of strategic schemes, few of them at all applicable to the situation and resulting in little but waste of time. Barclay was practically superseded by the Emperor’s following, and being naturally a man of diffident and retiring nature, and unused to supreme command, he did not sufficiently assert himself. Among the officers who appeared in Alexander’s suite was old General Bennigsen, who had commanded not without credit against Napoleon in 1807, and probably hoped to induce the Tzar to give him an important command. [Illustration: PRINCE EUGÈNE Son of the ex-Empress Josephine, Viceroy of Italy, and Commander of the 4th French Army Corps From the picture by Scheffer at Versailles] By the beginning of June it was becoming clear that Napoleon’s attack would be delivered across the Niemen. Bagration was thereupon ordered to leave a corps, under General Tormazov, to defend Volhynia against the Austrians about Lemberg, and to march with the 7th and 8th Corps through the Pinsk Marshes to Pruzhani. This movement appears to have escaped Napoleon until the last. As the French continued to advance, inclining more and more to the left, and pushing forward in dense masses into the north-east corner of Prussia, Bagration moved on to Volkovisk, about 100 miles south-southwest of Vilna, Napoleon believing him to be still at Lutsk and Brest-Litovsk.