The Offensive opened with a six hour bombardment, brief by Great War standards. In the three hours prior to H hour the Americans fired off more munitions than both sides fired off in the four years of the American Civil War. Ten American divisions, approximately 260,000 men, advanced along with 700 tanks. The attack is largely initially successful with some 23,000 German troops captured, with American advances up to six miles. Here is General Pershing’s report on the first four days of the Offensive:
Following three hours of violent artillery fire of preparation, the Infantry advanced at 5.30 a.m. on September 26th, accompanied by tanks. During the first two days of the attack, before the enemy was able to bring up his reserves, our troops made steady progress through the network of defences. Montfaucon was held tenaciously by the enemy and was not captured until noon of the second day.
By the evening of the 28th a maximum advance of 11 kilometres had been achieved and we had captured Baulny, Epinonville, Septsarges, and Dannevoux. The right had made a splendid advance into the woods south of Brieullessur-Meuse, but the extreme left was meeting strong resistance in the Argonne.
The attack continued without interruption, meeting six new divisions which the enemy threw into first line before September 29th. He developed a powerful machine-gun defence supported by heavy artillery fire, and made frequent counter-attacks with fresh troops, particularly on the front of the Twenty-eighth and Thirty-fifth Divisions.
These divisions had taken Varennes, Cheppy, Baulny, and Charpentry, and the line was within 2 kilometres of Apremont. We were no longer engaged in a manoeuvre for the pinching out of a salient, but were necessarily committed, generally speaking, to a direct frontal attack against strong, hostile positions fully manned by a determined enemy.
By nightfall of the 29th the First Army line was approximately Bois de la Cote Lemont-Nantillois-Apremont – southwest across the Argonne. Many divisions, especially those in the centre that were subjected to cross-fire of artillery, had suffered heavily. The severe fighting, the nature of the terrain over which they attacked, and the fog and darkness sorely tried even our best divisions.
On the night of the 29th the Thirty-seventh and Seventy-ninth Divisions were relieved by the Thirty-second and Third Divisions, respectively, and on the following night the First Division relieved the Thirty-fifth Division.
The critical problem during the first few days of the battle was the restoration of communications over “No man’s land.” There were but four roads available across this deep zone, and the violent artillery fire of the previous period of the war had virtually destroyed them. The spongy soil and the lack of material increased the difficulty. But the splendid work of our engineers and pioneers soon made possible the movement of the troops, artillery, and supplies most needed. By the afternoon of the 27th all the divisional artillery, except a few batteries of heavy guns, had effected a passage and was supporting the infantry action.
The initial stage can be rated a success, but with grave deficiencies shown in American training and leadership and hence the pause for reorganization and to replace the initial attacking divisions. The Offensive would resume on October 4, 1918.