Belleau Wood is a forested area in France that became famous during World War I. In June 1918, it was the site of a significant battle between American forces and German troops. The battle was part of the larger Second Battle of the Marne and marked a turning point for the Allies. The fighting in Belleau Wood was intense, with American soldiers demonstrating bravery and determination. The U.S. Marines played a crucial role in the battle, earning a reputation for their tenacity. The area is now a memorial site, honoring those who fought and died there, including the U.S. Marines.