The Allied progress elsewhere cheered the efforts of our men in this crucial contest as the German command threw in more and more first-class troops to stop our advance. We made steady headway in the almost impenetrable and strongly held Argonne Forest, for, despite this reinforcement, it was our army that was doing the driving. Our aircraft was increasing in skill and numbers and forcing the issue, and our infantry and artillery were improving rapidly with each new experience. The replacements fresh from home were put into exhausted divisions with little time for training, but they had the advantage of serving beside men who knew their business and who had almost become veterans overnight. The enemy had taken every advantage of the terrain, which especially favored the defense by a prodigal use of machine guns manned by highly trained veterans and by using his artillery at short ranges. In the face of such strong frontal positions we should have been unable to accomplish any progress according to previously accepted standards, but I had every confidence in our aggressive tactics and the courage of our troops. PROGRESS UNDER DIFFICULTIES. On October 4 the attack was renewed all along our front. The Third Corps tilting to the left followed the Brieulles-Cunel road; our Fifth Corps took Gesnes, while the First Corps advanced for over two miles along the irregular valley of the Aire River and in the wooded hills of the Argonne that bordered the river, used by the enemy with all his art and weapons of defense. This sort of fighting continued against an enemy striving to hold every foot of ground and whose very strong counter-attacks challenged us at every point. On the 7th the First Corps captured Chatel-Chehery and continued along the river to Cornay. On the east of Meuse sector one of the two divisions co-operating with the French captured Consenvoye and the Haumont Woods. On the 9th the Fifth Corps, in its progress up the Aire, took Fleville, and the Third Corps, which had continuous fighting against odds, was working its way through Brieulles and Cunel. On the 10th we had cleared the Argonne Forest of the enemy. FORMATION OF SECOND ARMY. It was now necessary to constitute a second army, and on October 9 the immediate command of the First Army was turned over to Lieut. Gen. Hunter Liggett. The command of the Second Army, whose divisions occupied a sector in the Woevre, was given to Lieut. Gen. Robert L. Bullard, who had been commander of the First Division and then of the Third Corps. Major General Dickman was transferred to the command of the First Corps, while the Fifth Corps was placed under Maj. Gen. Charles P. Summerall, who had recently commanded the First Division. Maj. Gen. John L. Hines, who had gone rapidly up from regimental to division commander, was assigned to the Third Corps. These four officers had been in France from the early days of the expedition and had learned their lessons in the school of practical warfare.