In the drenching rain the French pushed forward, dragging their guns with great difficulty up the slippery slope. They carried three lines of German trenches, and were soon in possession of the hill. Meanwhile other troops had seized Hill 151. Though the Germans tried hard to recover the positions next day, they could not do so. Nothing happened on Sunday, 9th January; but on Monday, about noon, no less than two German corps, under von Kluck, were launched against the French, who were holding the hills. On the 12th the struggle grew very violent. The French were pushed off the eastern side of Hill 132, but with great difficulty they managed to cling to the western slopes.
During the four preceding days the weather had been very bad. Torrents of rain had descended without ceasing, and by the 12th the river was in high flood. It had been rising for days, and now it was swirling along like an angry torrent, threatening to carry away the only bridges by which the French could bring up reinforcements and ammunition. By the 13th all the bridges but two had been swept away, and the French decided to retreat across the river while they had the means of doing so.
They retired slowly and skilfully. Their batteries were withdrawn from the hills one by one, without letting the Germans know that they were being moved to the rear. The commander of one battery did not give the order to retire until the Germans were within five hundred yards of him. It was perilous and difficult work getting the guns down the steep slope. The gunners man-handled them until they reached the foot, and then they were limbered up and taken across a shaky pontoon bridge which had been thrown across the river at Missy. Guns on the right and centre had to be abandoned, but not before they were rendered useless.
By the evening of the 14th the Germans had advanced their line until they held the whole of the north bank of the Aisne from a mile east of Soissons to Missy. By this time the French, who only numbered 12,000, had been reduced to half their strength, and they had lost about twenty guns. Von Kluck had begun well, and, under the eye of the Kaiser, he now made a great effort to capture Soissons. Had he done so, he would have been in possession of a railway junction and the best bridge over the Aisne. He would also have been able to force the French to retire from the whole line of the river.