General John Pershing thought that a successful Allied attack in the region of St. Mihiel,
Metz, and
Verdun would have a significant effect on the
German Army. Pershing had to persuade
Marshal Foch (the supreme Allied military commander) to permit an American attack on the salient.
Weather reports The weather corps of Corps I Operation Order stated: "Visibility: Heavy driving wind and rain during parts of day and night. Roads: Very muddy."
German defensive positions Prior to the American operation, the Germans installed many in-depth series of
trenches, wire obstacles, and
machine-gun nests. The Allied forces discovered the information on a written order to
Army Group Gallwitz. 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 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.
Allied air support at St. Mihiel. Chief of the
United States Army Air Service Mason Patrick oversaw the organization of 28 air squadrons for the battle, with the French, British, and Italians contributing additional units to bring the total force numbers to 701 pursuit planes, 366 observation planes, 323 day bombers, and 91 night bombers. The 1,481 total aircraft made it the largest air operation of the war. The French Army engaged the newly created Division Aérienne (Air Division), under command of General Duval, with a strength of 717 planes (24 fight squadron / 432
SPAD VII, 15 Close Air Support squadron / 225
BREGUET XIV, 4 reconnaissance squadron / 60 CAUDRON R XI). Five French fighter groups and 3 US Army fighter / bomber groups were also engaged. ==Battle==