In spite of the generous cordiality of the population, who lavished their resources upon those from whom they hoped for deliverance, Napoleon and his troops perceived that they had entered a desert. "Our soldiers find that the solitudes of Poland contrast with the smiling fields of their own country; but they add immediately, 'They are a fine people, these Poles!'" Before establishing himself for the winter in this savage country, under a frozen sky, and on a cold and damp soil, it was necessary to push back the enemy. Napoleon only went to Warsaw, and advanced towards the Russians entrenched behind the Narew and the Ukra. Already his lieutenants, Davout, Augereau, Ney, had taken up positions for attack. Furious battles at Czarnovo, at Pultusk, at Golymin, at Soldau, obliged the Russians to fall back upon the Pregel, without disaster to their _corps d'armée_, although they had been constantly beaten. The rigor of the season had prevented those grand concentrations of forces and those brilliant strokes in which Napoleon ordinarily delighted; the troops advanced with difficulty through impenetrable forests, soaked by the rain: the men fell in great numbers without a battle. In the month of January, 1807, the emperor at last took up his winter-quarters, carefully fortifying his positions, and laying siege to the towns which still resisted him in Silesia. Breslau, Glogau, Brieg successively succumbed. The old Marshal Lefebvre was charged with the siege of Dantzig. Meanwhile the Russians, henceforth concentrated under the orders of General Benningsen, and less affected than the French by the inclemencies to which they were accustomed, had not suspended their military operations. Soon Marshal Ney, in one of those armed reconnoitering expeditions which he often risked without orders, was able to assure himself that the enemy was approaching us by a prolonged movement, which was to bring him to the shore of the Baltic. Already a few battles had taken place. The weather became cold; ice succeeded to the mud. Napoleon quitted Warsaw on January 30th, resolved to march against the enemy. "Since when have the conquered had the right of choosing the finest country for their winter-quarters?" said the proclamation to the army. Twice a great battle appeared imminent; twice a movement of the Russians in retreat enabled them to escape from the overwhelming forces which Napoleon had been able to collect; a few skirmishes, however, signalized the first days of February. On the seventh day's march General Benningsen entered Eylau.