Offensive of July 18
The great force of the German Château-Thierry offensive established the deep Marne salient, but the enemy was taking chances, and the vulnerability of this pocket to attack might be turned to his disadvantage. Seizing this opportunity to support my conviction, every division with any sort of training was made available for use in a counter-offensive. The place of honor in the thrust toward Soissons on July 18 was given to our 1st and 2d Divisions in company with chosen French divisions. Without the usual brief warning of a preliminary bombardment, the massed French and American artillery, firing by the map, laid down its rolling barrage at dawn while the infantry began its charge. The tactical handling of our troops under these trying conditions was excellent throughout the action. The enemy brought up large numbers of reserves and made a stubborn defense both with machine guns and artillery, but through five days' fighting the 1st Division continued to advance until it had gained the heights above Soissons and captured the village of Berzy-le-Sec. The 2d Division took Beau Repaire Farm and Vierzy in a very rapid advance and reached a position in front of Tigny at the end of its second day. These two divisions captured 7,000 prisoners and over 100 pieces of artillery.
The 26th Division, which, with a French division, was under command of our 1st Corps, acted as a pivot of the movement toward Soissons. On the 18th it took the village of Torcy, while the 3d Division was crossing the Marne in pursuit of the retiring enemy. The 26th attacked again on the 21st, and the enemy withdrew past the Château-Thierry-Soissons road. The 3d Division, continuing its progress, took the heights of Mont St. Père and the villages of Chartèves and Jaulgonne in the face of both machine-gun and artillery fire.
On the 24th, after the Germans had fallen back from Trugny and Epieds, our 42d Division, which had been brought over from the Champagne, relieved the 26th, and, fighting its way through the Forêt de Fère, overwhelmed the nest of machine guns in its path. By the 27th it had reached the Ourcq, whence the 3d and 4th Divisions were already advancing, while the French divisions with which we were co-operating were moving forward at other points.
The 3d Division had made its advance into Ronchères Wood on the 29th and was relieved for rest by a brigade of the 32d. The 42d and 32d undertook the task of conquering the heights beyond Cierges, the 42d capturing Sergy and the 32d capturing Hill 230, both American divisions joining in the pursuit of the enemy to the Vesle, and thus the operation of reducing the salient was finished. Meanwhile the 42d was relieved by the 4th at Chéry-Chartreuve, and the 32d by the 28th, while the 77th Division took up a position on the Vesle. The operations of these divisions on the Vesle were under the 3d Corps, Major Gen. Robert L. Bullard commanding.
Battle of St. Mihiel
With the reduction of the Marne salient, we could look forward to the concentration of our divisions in our own zone. In view of the forthcoming operation against the St. Mihiel salient, which had long been planned as our first offensive action on a large scale, the First Army was organized on Aug. 10 under my personal command. While American units had held different divisional and corps sectors along the western front, there had not been up to this time, for obvious reasons, a distinct American sector; but, in view of the important parts the American forces were now to play, it was necessary to take over a permanent portion of the line. Accordingly, on Aug. 30, the line beginning at Port sur Seille, east of the Moselle and extending to the west through St. Mihiel, thence north to a point opposite Verdun, was placed under my command. The American sector was afterward extended across the Meuse to the western edge of the Argonne Forest, and included the 2d Colonial French, which held the point of the salient, and the 17th French Corps, which occupied the heights above Verdun.
The preparation for a complicated operation against the formidable defenses in front of us included the assembling of divisions and of corps and army artillery, transport, aircraft, tanks, ambulances, the location of hospitals, and the molding together of all the elements of a great modern army with its own railheads, supplied directly by our own Service of Supply. The concentration for this operation, which was to be a surprise, involved the movement, mostly at night, of approximately 600,000 troops, and required for its success the most careful attention to every detail.
The French were generous in giving us assistance in corps and army artillery, with its personnel, and we were confident from the start of our superiority over the enemy in guns of all calibres. Our heavy guns were able to reach Metz and to interfere seriously with German rail movements. The French Independent Air Force was placed under my command, which, together with the British bombing squadrons and our air forces, gave us the largest assembly of aviators that had ever been engaged in one operation on the western front.
From Les Eparges around the nose of the salient at St. Mihiel to the Moselle River the line was, roughly, forty miles long and situated on commanding ground greatly strengthened by artificial defenses. Our 1st Corps (82d, 90th, 5th, and 2d Divisions), under command of Major Gen. Hunter Liggett, resting its right on Pont-à-Mousson, with its left joining our 3d Corps (the 89th, 42d, and 1st Divisions), under Major Gen. Joseph T. Dickman, in line to Xivray, was to swing toward Vigneulles on the pivot of the Moselle River for the initial assault. From Xivray to Mouilly the 2d Colonial French Corps was in line in the centre, and our 5th Corps, under command of Major Gen. George H. Cameron, with our 26th Division and a French division at the western base of the salient, was to attack three difficult hills—Les Eparges, Combres, and Amaranthe. Our 1st Corps had in reserve the 78th Division, our 4th Corps the 3d Division, and our First Army the 35th and 91st Divisions, with the 80th and 33d available. It should be understood that our corps organizations are very elastic, and that we have at no time had permanent assignments of divisions to corps.