In the preliminary operations this deterioration was not apparent. The troops marched doggedly through the mud, worked hard when called upon, and although their rations, which were supplied by rascally contractors, were very bad and altogether different from those to which they had become accustomed in the years just preceding, the men ate them without murmuring. But when, on December twenty-sixth, they joined battle, the old push and nerve seemed lacking. The preparations had been made on the plan of concentration, but at the last moment Lannes was detached with his division to cut off the enemy's line of retreat over the Narew. Napoleon, as at Jena, believed the main army of his opponent to be where it was not, and he was incautious in thus dividing and weakening his forces. Accordingly the battle had an irregular and indecisive character. Lannes came unexpectedly upon the mass of the Russian army, two columns forming the center and right, and engaged them from ten in the morning until two in the afternoon. At that hour a reserve arrived under Gudin, and attacked the Russian right. But Bennigsen, the commander of that column, had ready a fresh reserve, and with its aid the newcomers were repulsed. Lannes, who had simultaneously made a final onset, was also beaten off by the superior force of his enemy. On the same day, Murat, Davout, and Augereau reached the neighboring village of Golymin, expecting to find the Russian center there; on the left wing, at Neidenburg, Ney stood face to face with Lestocq and his Prussians. There was nothing but skirmishing at either place, for the French emperor could not drag his artillery through the mud swiftly enough to make it tell at the right time, and both Prussians and Russians drew slowly off. Soult was to have repeated the turning manoeuver as carried out before Jena, but the marching was so difficult, owing to a thaw, that he could not accomplish anything like the necessary distance.