The Harlem Hellfighters were an African American infantry regiment, officially known as the 369th Infantry Regiment, that fought during World War I. They were renowned for their bravery and tenacity, spending 191 days in combat, more than any other American unit. The regiment was awarded the French Croix de Guerre for their exceptional performance on the battlefield. Formed in 1913, the Harlem Hellfighters were part of the larger U.S. Army and played a crucial role in the Meuse-Argonne Offensive. They were also notable for their contributions to jazz music, as many members were musicians who helped popularize the genre in Europe.