What is ironic about the ending of movie Glory?

The irony in the movie Glory is the scene where the audience first sees the African-American soldiers of the 54th Massachusetts Infantry Regiment marching at the end of the film. The sight is a powerful symbol of the victory the 54th fought for and that the African-Americans had to overcome the adversity of slavery. Despite the fact that they had just won a significant battle, the end scene serves as a reminder of the prejudice and the struggle for civil rights that African Americans still had to face. This powerful juxtaposition of triumph and struggle highlights the ongoing nature of the fight for equality.