Final answer:
In September, roughly 50,000 American soldiers, known as doughboys, defeated the Germans at St. Mihiel, east of the Meuse.
Step-by-step explanation:
By the middle of July, the Allies had halted the German offensive in World War I. The Allied forces, including American soldiers known as "doughboys," began an offensive of their own. In September; about 50,000 doughboys, fighting alone, defeated the Germans at St. Mihiel, east of the Meuse. This pivotal battle was part of the larger Meuse-Argonne offensive that took place in the late stages of the war and marked a significant turning point in the conflict, leading to the eventual retreat and surrender of German forces.