Radzivil, whose incompetency had grown evident, was now removed, and Skrzynecki, a much abler leader, was chosen in his place. He was not long in showing his skill and daring. On the night of March 30 the Praga bridge was covered with straw and the army marched noiselessly across. At daybreak, in the midst of a thick fog, it fell on a body of sleeping Russians, who had not dreamed of such a movement. Hurled back in disorder and dismay, they were met by a division which had been posted to cut off their retreat. The rout was complete. Half the corps was destroyed or taken, and the remainder fled in terror through the forest depths. Before the day ended the Poles came upon Rosen's division, fifteen thousand in number, and strongly posted. Yet the impetuous onslaught of the Poles swept the field. The Russians were driven back in utter rout, with the loss of two thousand men, six thousand prisoners, and large quantities of cannon and arms. The Poles lost but three hundred men in this brilliant success. During the next day the pursuit continued, and five thousand more prisoners were taken. So disheartened were the Russian troops by these reverses that when attacked on April 10 at the village of Iganie they scarcely attempted to defend themselves. The flower of the Russian infantry, the _lions of Varna_, as they had been called since the Turkish war, laid down their arms, tore the eagles from their shakos, and gave themselves up as prisoners of war. Twenty-five hundred were taken. What immediately followed may be told in a few words. Skrzynecki failed to follow up his remarkable success, and lost valuable time, in which the Russians recovered from their dismay. The brave Dwernicki, after routing a force of nine thousand with two thousand men, crossed the frontier and was taken prisoner by the Austrians, who had made no objection to its being crossed by the Russians. And, as if nature were fighting against Poland, the cholera, which had crossed from India to Russia and infected the Russian troops, was communicated to the Poles at Iganie, and soon spread throughout their ranks. The climax in this suicidal war came on the 26th of May, when the whole Russian army, led by General Diebitsch, advanced upon the Poles. During the preceding night the Polish army had retreated across the river Narew, but, by some unexplained error, had left Lubienski's corps behind. On this gallant corps, drawn up in front of the town of Ostrolenka, the host of Russians fell. Flanked by the Cossacks, who spread out in clouds of horsemen on each wing, the cavalry retreated through the town, followed by the infantry, the 4th regiment of the line, which formed the rear-guard, fighting step by step as it slowly fell back.