The King of Prussia had refused to accept the harsh conditions of the armistice; he had resolved to struggle to the end, and to join the remains of his forces to the army of the Emperor Alexander. "Your Majesty has had me informed that you are throwing yourself into the arms of the Russians," wrote Napoleon to King Frederick William. "The future will make it apparent whether you have chosen the best and most effective part. You have taken the dice-box and thrown the dice, and the dice will decide the question." Already the French armies had entered Poland, but they were not there alone; two Russian corps, under the orders of General Benningsen and General Buxhouden, had crossed the Niemen, and advanced towards the Vistula, and soon afterwards they entered Warsaw. Marshals Davout and Lannes sent reports, apparently contradictory, but in reality identical, as to popular feeling in Poland. Davout had found at Posen an extreme enthusiasm; he could scarcely furnish with arms those who pressed forward to ask for them; the same sentiment animated the population of Warsaw, when he made his entry in pursuit of the Russians, who fell back before him. Meanwhile he wrote to the emperor, on December 1st: "Levies of men are very easily made, but there is a want of persons who can direct their instruction and organization. There is also a want of guns. The feeling of Warsaw is excellent, but the upper class are making use of their influence to calm the ardor which is prevalent in the middle classes. The uncertainty of the future terrifies them, and they leave it to be sufficiently understood that they will only openly declare themselves when, with the declaration of their independence, they can also receive tacit guarantees for its maintenance." Lannes regretted the campaign in Poland; he recommended that they should establish themselves on the Oder, and pointed out the inconveniences and dangers of the enterprise they were about to attempt in a sterile and desert country. "They are always the same--frivolous, divided, anarchical; we shall uselessly waste our blood for their sakes, without founding anything durable."