A sudden hard frost rendered the country passable, which had before been in so swampy a condition as to render marching very difficult. This was much to the advantage of the Prussians. Napoleon detached the forces under Marmont and Mortier, whom he had united with his own, to press upon and harass the retreat of the Prussian field-maréchal; while he himself, pushing on by a shorter line, possessed himself of the town of Fismes, about half way betwixt Rheims and Soissons. The occupation of this last place was now a matter of the last consequence. If Blucher should find Soissons open to him, he might cross the Marne, extricate himself from his pursuers without difficulty, and form his junction with the army of the North. But if excluded from this town and bridge, Blucher must have hazarded a battle on the most disadvantageous terms, having Mortier and Marmont on his front, Napoleon on his left flank, and in his rear, a town, with a hostile garrison and a deep river.
It was almost a chance, like that of the dice, which party possessed this important place. The Russians had taken it on 15th February;[1] but, being immediately evacuated by them, it was on the 19th occupied by Mortier, and garrisoned by 500 Poles, who were imagined capable of the most determined defence. On the 2d March, however, the commandant, intimidated by the advance of Bulow's army of 30,000 men, yielded up Soissons to that general, upon a threat of an instant storm, and no quarter allowed. The Russian standards then waved on the ramparts of Soissons, and Blucher, arriving under its walls, acquired the full power of uniting himself with his rear-guard, and giving or refusing battle at his pleasure, on the very moment when Buonaparte, having turned his flank, expected to have forced on him a most disadvantageous action.
The Emperor's wrath exhaled in a bulletin against the inconceivable baseness of the commandant of Soissons, who was said to have given up so important a place when he was within hearing of the cannonade on the 2d and 3d, and must thereby have known the approach of the Emperor.[2] In the heat of his wrath, he ordered Soissons to be assaulted and carried by storm at all risks; but it was defended by General Langeron with 10,000 Russians. A desperate conflict ensued, but Langeron retained possession of the town.