By 10 o'clock the Third Infantry Brigade had reached a point one mile south of Vendresse, and from there it was ordered to continue the line of the First Brigade and to connect with and help the right of the Second Division. A strong hostile column was found to be advancing, and by a vigorous counterstroke with two of his battalions the Brigadier checked the advance of this column and relieved the pressure on the Second Division. From this period until late in the afternoon the fighting consisted of a series of attacks and counter-attacks. The counter-strokers by the enemy were delivered at first with great vigor, but later on they decreased in strength, and all were driven off with heavy loss. On the left the Sixth Infantry Brigade had been ordered to cross the river and to pass through the line held during the preceding night by the Fifth Infantry Brigade and occupy the Courtecon Ridge, while a detached force, consisting of the Fourth Guards Brigade and the Thirty-sixth Brigade Royal Field Artillery, under Brig. Gen. Perceval, were ordered to proceed to a point east of the village of Ostel. The Sixth Infantry Brigade crossed the river at Pont-Arcy, moved up the valley toward Braye, and at 9 A.M. had reached the line Tilleul-La-Buvelle. On the line they came under heavy artillery and rifle fire, and were unable to advance until supported by the Thirty-fourth Brigade, Royal Field Artillery, and the Forty-fourth Howitzer Brigade and the Heavy Artillery. The Fourth Guards Brigade crossed the river at 10 A.M. and met with very heavy opposition. It had to pass through dense woods; field artillery support was difficult to obtain; but one section of a field battery pushed up to and within the firing line. At 1 P.M. the left of the brigade was south of the Ostel Ridge. At this period of the action the enemy obtained a footing between the First and Second Corps, and threatened to cut the communications of the latter. Sir Douglas Haig was very hardly pressed and had no reserve in hand. I placed the cavalry division at his disposal, part of which he skillfully used to prolong and secure the left flank of the Guards Brigade. Some heavy fighting ensued, which resulted in the enemy being driven back with heavy loss. About 4 o'clock the weakening of the counter-attacks by the enemy and other indications tended to show that his resistance was decreasing, and a general advance was ordered by the army corps commander. Although meeting with considerable opposition and coming under very heavy artillery and rifle fire, the position of the corps at the end of the day's operations extended from the Chemin-des-Dames on the right, through Chivy, to Le Cour de Soupir, with the First Cavalry Brigade extending to the Chavonne-Soissons road. [Illustration: Map 9.--Sept. 13 and 14. Passage of the Aisne, when bridges were constructed under great difficulties.]