During this day further bodies of British troops crossed the river. The forces already on the north side were heavily engaged. Towards nightfall the Germans attempted a counter-attack. It was beaten off after severe fighting. Three hours later, about ten o'clock at night, they again descended in force against the positions and villages held by the British troops. While the clefts and side valleys blazed with flashing fire of infantry, the valley of the Aisne was lit up for miles with the fluctuating and lurid flare from the heavy guns. Masses of German infantry tried to drive the British troops out of the villages they had seized. It was evidently hoped to prevail by weight of numbers. The onset fell back crippled by the losses sustained.

By this time the fact was becoming plain that the battle was no mere rearguard action. The enemy had manifestly resolved to make a stand. To ascertain the character and strength of his disposition, Sir John French ordered a general advance. It was timed to begin at daybreak.

The dawn broke amid rain and heavy mists, but this, if a disadvantage to the attack, was equally a disadvantage to the defence. One of the leading features of this offensive was what Sir John French has justly called the bold and decisive action of the 1st army corps, commanded by Sir Douglas Haig.

From Bourg, the scene of the crossing on the aqueduct, there runs northward climbing to the summit of the ridge a road to the village of Cerny, about half-way along the Chemin des Dames. The distance from Bourg to Cerny is rather more than three miles. It is, however, a stiff climb. Two-thirds of the way up, where the road bends sharply to the left round a spur, is the village of Vendresse-et-Troyon. The capture of this place was one of the immediate objectives, and the troops told off to accomplish it were the 1st infantry brigade and the 25th artillery brigade, under General Bulfin.[23] At Cerny there is a slight dip on the level of the ridge.

Vendresse is on the west slope of this side valley, and Troyon on the east slope just behind the spur. The Germans held in strong force both the spur and the houses on each slope. At Troyon they had fortified themselves in a factory.

Few operations could be more ticklish than the seizure of such a place. From the spur the Germans came down in a counter-attack like a human avalanche. After stemming this rush by a withering fire the Northamptons were ordered to carry the spur at the point of the bayonet. They did it. As they were chasing the survivors of the counter-attack up the slope there suddenly appeared on the skyline a second mass of German infantry, the reserves supporting the counter-attacking column. In a matter of seconds, however, the fugitives and the Northamptons were on them. Their ranks broken, they also turned and fled in rout across the plateau.

In the meantime the North Lancashires had stormed the factory and cleared the enemy out of Vendresse at the point of the bayonet. Other troops of the 1st army corps pushed on to Meulins, a mile to the south-east, and seized positions along the east end of the ridge. During the fighting the Germans lost 12 field guns and 600 prisoners. Many of the latter were found to belong to the Landwehr, proving that the enemy had already been compelled to fill up his formations from second reserves.

The fury of this fighting was intense. There could be no better evidence of its character than an unposted letter found later on an officer of the 7th German army reserve corps. The letter runs:—

Cerny, S. of Laon, Sept. 17, 1914.

My dear Parents,—Our corps has the task of holding the heights south of Cerny in all circumstances till the 15th corps on our left flank can grip the enemy's flank. On our right are other corps. We are fighting with the English Guards, Highlanders, and Zouaves.[24] The losses on both sides have been enormous. For the most part this is due to the too brilliant French artillery. The English are marvellously trained in making use of the ground. One never sees them, and one is constantly under fire.

Three days ago our division took possession of these heights, dug itself in, &c. Two days ago, early in the morning, we were attacked by immensely superior English forces (one brigade and two battalions), and were turned out of our positions; the fellows took five guns from us. It was a tremendous hand-to-hand fight. How I escaped myself I am not clear. I then had to bring up supports on foot (my horse was wounded and the others were too far in rear). Then came up the Guard Jager Battalion, 4th Jager, 65th Regiment, Reserve Regiment 13, Landwehr Regiments 13 and 16, and with the help of the artillery drove back the fellows out of the position again.

... During the first two days of the battle[25] I had only one piece of bread and no water, spent the night in the rain without my great coat. The rest of my kit was on the horses which have been left miles behind with the baggage, which cannot come up into the battle because as soon as you put your nose out from behind cover the bullets whistle.

Yesterday evening about six p.m., in the valley in which our reserves stood, there was such a terrible cannonade that we saw nothing of the sky but a cloud of smoke. We had few casualties.