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However, the German Army stationed in the area of St. Mihiel lacked sufficient manpower, firepower and effective leadership to launch a counter-attack of its own against the Allies. With Allied offensives to the north, the Germans decided to pull out of the St. Mihiel Salient and consolidate their forces near the Hindenburg Line. The order to evacuate the area was given on 8 September. The Allied forces discovered the information on a written order to Army Group Gallwitz.
Allied tank support
Although the AEF was new to the French theater of war, it trained hard for nearly a year in preparation for fighting against the German armies. In June 1917 Pershing ordered the creation of a tank force to support the AEF's infantry. As a result, by September 1918, Lieutenant Colonel George S. Patton Jr. had finished training two tank battalions – 144 French-built Renault FT light tanks organized as the 344th and 345th Battalions of the United States Tank Corps – at Langres, France for an upcoming offensive at the St. Mihiel salient. "Due to the serious resistance of the enemy, especially along the eastern edge of the FORET d’ARGONNE and in the vicinity of CHEPPY and VARENNES, and due also the lack of support of the Infantry, all the Tanks had contrary to plan entered the action before evening of the first day. The 344th Battalion supporting the advance of the 28th and 35th Divisions left the positions of departure and advanced ahead of the Infantry at H-hour (5:30 a.m.) On the morning of the 26th, Colonel G. S. Patton, Jr., commanding the Brigade of Tanks, was wounded while getting Tanks forward and rallying disorganized Infantrymen to attack enemy resistance. Major Sereno E. Brett, commanding the 344th Battalion, was then placed in command of the Brigade." Patton was awarded the Distinguished Service Cross for his "extraordinary heroism" that day. In addition to the 144 AEF tanks, the attack was joined by 275 French tanks (216 FTs and 59 Schneider CA1 and Saint-Chamond tanks) of the French 1st Assault Artillery Brigade; a total of 419 tanks.
Battle
The Saint-Mihiel offensive began on 12 September with a threefold assault on the salient. The main attack was made against the south face by two American corps. On the right was the I Corps (from right to left the 82nd, 90th, 5th, and 2nd Divisions in line with the 78th in reserve) covering a front from Pont-à-Mousson on the Moselle west toward Limey; on the left, the IV Corps (from right to left the 89th, 42d, and 1st Divisions in line with the 3rd in reserve) extending along a front from Limey west toward Marvoisin.