Covered by the low rolling hillocks of the district, the army now moved off to its right across the Austrian front, the advance led by Zieten and half the cavalry, the rear covered by Driessen with the remaining half—some 4o weak squadrons. The infantry having gained a position sufficiently on the Austrian flank, now wheeled into line and attacked in echelon of battalions from the right. The battle soon became desperate, and the Austrian cavalry on their right wing under Luchesi, unaware of Driessen's presence as a flank guard, issued out of their lines, wheeled to their left and swept down upon the refused flank of the Prussian infantry; but they never reached them, for Driessen, seizing his opportunity, set his squadrons in motion and attacked. The Austrians, completely surprised, were ridden down and driven back on to the front of their own infantry, and the pressure of the fugitives threw the rear of their left wing into confusion and in a short time the ruin of their army was completed. When the news of Driessen's charge was brought to the king his astonishment was expressed in the single phrase, "What, that old fool Driessen?" The fighting, however, had been desperate, and though the Austrians out of their 72,000 lost 37% including 20,000 prisoners, with 116 guns, the Prussians lost 6,200
making with the other battles of the year a total of nearly 75,000 men, and not including losses in minor skirmishes and on the march.
The raid upon Berlin had accomplished nothing, and the advance of the Russian main body had died out for want of resolution to seize the opportunities offered by Fred erick the Great's absence. The Tsaritsa, annoyed by his slowness, recalled Apraxin and appointed Fermor in his place. Utilizing the winter snows, he collected some 31,00o men and crossed the frontiers of East Prussia (Jan. f o, 1758) and attempted to annex the province, driving out all the Prussian officials who refused to swear fealty to Elizabeth. This took time, and when the period of thaw supervened the Russians were immobilized and could not advance until approaching summer had dried the roads again. For the moment, therefore, no danger threatened Frederick from this quarter, and Rossbach had effectually tamed the French. The Swedes, too, showed little energy, the "roadless" period affecting them equally with the Russians.
Frederick therefore resolved to seize the opportunity to renew his invasion of Austria. As a beginning he recaptured Schweid nitz in April with 5,00o prisoners. The Austrian field army under Daun lay about Koniggratz, covering all the passes out of Silesia; but covered by the newly formed "Free Corps" (his answer to the semi-savage Croats, Pandours and Tolpatches of the Austri ans), Frederick marched right across their front on Olmiitz, whilst a special corps (30,000) under Prince Henry threatened their left from Saxony and the Elbe. He had with him about 40,000 men. But Olmiitz lay 90 m. from the Prussian frontier,
and the Austrian light troops swarmed in the intervening district. Ultimately a great Prussian convoy was destroyed in the action of Domstadl, and the siege of Olmiitz had to be raised (July ) ; but instead of marching back the way he had come Frederick led his troops through Bohemia practically in the rear of Daun's army, and on July 14 entered Daun's empty entrenchments at Koniggratz. Fermor's Russians were now again in the field and had reached Posen, burning and plundering horribly. By skilful manoeuvring the king deceived the Austrians till the roads to Silesia by Skalitz and Nachod were open and then by a rapid march passed over into Silesia, reaching Grussau (near Landshut) on Aug. 8. Leaving Keith with half his force to hold this district, he then marched to Frankfurt-on-the-Oder, taking with him only some 15,00o men, to strengthen the wing already engaged against the Russians. Frankfurt was reached on Aug. 20. Fermor was then besieging Ciistrin with 52,000 men, and hearing of the king's approach he raised the siege and placed himself behind a formid able obstacle facing north, near Zorndorf, from which direction the king was approaching.
Seeing that the same obstacle that pre vented him from attacking the Russians prevented them equally from attacking him, the king marched right round Fermor's eastern flank—the Russians gradually forming a fresh front to meet him—so that when the Prussian attack began on the morn ing of Aug. 25 they stood in three irregular squares, divided from each other by marshy hollows, and thus unable to render one another support. The king made his first effort against the square on the right—Seydlitz with his squadrons covering the movement. But the Russian troops fought with far more spirit than the Austrians had ever shown, and things were going very badly with the Prussians when Seydlitz, who in the meanwhile had succeeded in making paths across the Zaberngrund on which the Russian right rested, flung himself upon the great square, and rode over and destroyed the whole mass in a prolonged mêlée in which quarter was neither given nor asked. Relieved by this well-timed charge, the king now re-formed the infantry already engaged, and concentrated all his efforts on the south west angle of the great centre square. Again the Russians more than held their own, issuing forth from their squares and cap turing many field pieces. Some of the Prussian infantry was actually broken and in full flight when Seydlitz, with his ranks re-formed and his horses rested, returned and again threw him self upon the square exactly as on the previous occasion and with the same result—the square, as a formation, was broken, but groups still stood back to back and the most savage butchery ensued. Darkness put a stop to the slaughter. Of 36,000 Prussians 12,500 were killed or wounded, i,000 prisoners or missing (37.5%), and of 42,000 Russians about 21,000 had fallen (50%).