The build-up of the American Expeditionary Force (AEF) began in earnest in the summer of 1917, following the United States' declaration of war against Germany. Within a few months, hundreds of thousands of American soldiers were pouring into Europe, many with little to no combat experience.
Despite their inexperience, the American troops were eager and determined to make a difference. They were quickly integrated into existing Allied units, where they learned from their more seasoned comrades and began to contribute to the war effort.
The first major battle involving American troops was the Second Battle of the Marne in July 1918. In this battle, the AEF helped to halt a major German offensive and push back the German lines. This success boosted the morale of the Allied forces and signaled that the tide was beginning to turn in their favor.
In the months that followed, American troops played an increasingly important role in the war. They were particularly effective in trench warfare, where their fresh enthusiasm and willingness to take risks helped to break the stalemate.
The arrival of the AEF not only provided much-needed manpower but also brought a renewed sense of hope and determination to the Allied cause. Ultimately, their contribution was crucial to the Allied victory in November 1918.