The Russian army fell back upon Heilsberg, and there concentrating their forces made a most desperate stand. A very hard-fought action [10th June] here took place. The Russians, overpowered by superior numbers, and forced from the level ground, continued to defend with fury their position on the heights, which the French made equally strenuous efforts to carry by assault. The combat was repeatedly renewed, with cavalry, infantry, and artillery, but without the fiery valour of the assailants making any effectual impression on the iron ranks of the Russians.[275] The battle continued, till the approach of midnight, upon terms of equality; and when the morning dawned, the space of ground between the position of the Russians and that of the French, was not merely strewed, but literally sheeted over, with the bodies of the dead and wounded.[276] The Russians retired unmolested after the battle of Heilsberg, and crossing the river Aller, placed that barrier betwixt them and the army of Buonaparte, which, though it had suffered great losses, had, in consequence of the superiority of numbers, been less affected by them than the Russian forces. In the condition of Bennigsen's army, it was his obvious policy to protract the war, especially as reinforcements, to the number of thirty thousand men, were approaching the frontier from the interior of the empire. It was probably with this view that he kept his army on the right bank of the Aller, with the exception of a few bodies of cavalry, for the sake of observation and intelligence. On the 13th, the Russian army reached Friedland, a considerable town on the west side of the Aller, communicating with the eastern, or right bank of the river, by a long wooden bridge. It was the object of Napoleon to induce the Russian general to pass by this narrow bridge to the left bank, and then to decoy him into a general action, in a position where the difficulty of defiling through the town, and over the bridge, must render retreat almost impossible. For this purpose he showed such a proportion only of his forces, as induced General Bennigsen to believe that the French troops on the western side of the Aller consisted only of Oudinot's division, which had been severely handled in the battle of Heilsberg, and which he now hoped altogether to destroy. Under this deception he ordered a Russian division to pass the bridge, defile through the town, and march to the assault. The French took care to offer no such resistance as should intimate their real strength. Bennigsen was thus led to reinforce this division with another--the battle thickened, and the Russian general at length transported all his army, one division excepted, to the left bank of the Aller, by means of the wooden bridge and three pontoons, and arrayed them in front of the town of Friedland, to overpower, as he supposed, the crippled division of the French, to which alone he believed himself opposed.[277] [Sidenote: BATTLE OF FRIEDLAND.]