Academic Dr Brian Hall talks to me about his research into the overlooked experiences of the 325th Field Signal Battalion, the first Black signal unit in the U.S. Army during the First World War. His work highlights the battalion's contributions and the challenges they faced within a racially prejudiced military environment, arguing that their technical proficiency and combat service challenged racial stereotypes and contributed to the broader struggle for civil rights. Dr Hall is a historian based at the University of Salford.