The toil was stupendous: in one of the steep hollow tracks a number of cannon and wagons stuck fast; but the Emperor, making his rounds at midnight, brought the magic of his presence to aid the weary troops and rebuke the officers whose negligence had caused this block. Lantern in hand, he went up and down the line to direct the work; and Savary, who saw this scene, noted the wonder of the men, as they caught sight of the Emperor, the renewed energy of their blows at the rocks, and their whispers of surprise that _he_ should come in person when their officers were asleep. The night was far spent when, after seeing the first wagon right through the narrow steep, he repaired to his bivouac amidst his Guards on the summit, and issued further orders before snatching a brief repose. By such untiring energy did he assure victory. Apart from its immense effect on the spirits of his troops, his vigilance reaped a rich reward. Jena was won by a rapid concentration of troops, and the prompt seizure of a commanding position almost under the eyes of an unenterprising enemy. The corps of Soult and Ney spent most of the night and early morning in marching towards Jena and taking up their positions on the right or north wing, while Lannes and the Guard held the central height, and Augereau's corps in the Mühl-thal threatened the Saxons and Prussians guarding the Schnecke.[106] A dense fog screened the moves of the assailants early on the morrow, and, after some confused but obstinate fighting, the French secured their hold on the plateau not only above the town of Jena, where their onset took the Prussians by surprise, but also above the Mühl-thal, where the enemy were in force.