The siege train was hurried up from Dresden, and on the 9th of May his batteries on the south side of the city, and those of Keith on the north, opened fire on the city. For a month missiles were poured into the town. Magazines were blown up, and terrible destruction done, but the garrison held out firmly. At times they made sorties, but these were always driven in again, with much loss. But 50,000 men behind fortifications, however weak, were not to be attacked. Every approach to the city was closely guarded, but it became at last evident that, as long as the provisions held out, Prague was not to be taken.
The cannonade became less incessant, and after a month almost died away; for Daun had by this time gathered a large army, and it was evident that another great battle would have to be fought. If this was won by the Prussians, Prague would be forced to surrender. If not, the city was saved.
It was not until the 12th of June that Daun, a cautious and careful general, in accordance with urgent orders from Vienna prepared to advance. His force had now grown to 60,000; 40,000 of the garrison of Prague could be spared, to issue out to help him. Frederick had under 70,000, and of these a great portion must remain to guard their siege works. Thus, then, all the advantages lay with the relieving army.
Several officers in disguise were despatched, by Daun, to carry into Prague the news of his advance; and to warn Prince Karl to sally out, with the whole of his force, and fall upon the Prussians as soon as he attacked them in the rear. So vigilant, however, were the besiegers that none of these messengers succeeded in entering Prague.
On the 13th Frederick set out, with 10,000 men--to be followed by 4000 more under Prince Maurice, two days later, these being all that could be spared from the siege works--to join Bevern, who had fallen back as Daun advanced. The junction effected, Frederick joined Bevern and approached Daun, who was posted in a strong position near Kolin, thirty-five miles from Prague. On the 17th Prince Maurice arrived, and after several changes of position the armies faced each other on the 18th, within a short distance of Kolin.
Daun's new position was also a strong one, and was, in fact, only to be assailed on its right; and the Prussian army was moved in that direction, their order being to pay no attention to the Austrian batteries or musketry fire, but to march steadily to the spot indicated. This was done. Ziethen dashed with his hussars upon the Austrian cavalry, drawn up to bar the way; defeated them, and drove them far from the field; while Hulsen's division of infantry carried the village of Preezer, on the Austrian flank, in spite of the Austrian batteries. So far Frederick's combination had worked admirably.
Hulsen then attacked a wood behind it, strongly held by the Austrians. Here a struggle commenced which lasted the whole day, the wood being several times taken and lost. He was not supported, owing to a mistake that entirely upset Frederick's plan of battle.
While three miles away from the point where the attack was to be delivered, Mannstein, whose quickness of inspiration had largely contributed to the victory of Prague, now ruined Frederick's plan by his impetuosity. The corn fields, through which his division was marching towards the assault of the Austrian left, were full of Croats; who kept up so galling a fire that, losing all patience, he turned and attacked them.
The regiment to which he gave the order cleared the Croats off; but these returned, strongly reinforced. The regiments coming behind, supposing that fresh orders had arrived, also turned off; and in a short time the whole division, whose support was so sorely needed by Hulsen, were assaulting the almost impregnable Austrian position in front.
Another mistake--this time arising from a misconception of a too brief and positive order, given by Frederick himself--led Prince Maurice, who commanded the Prussian centre, to hurl himself in like manner against the Austrians.