What useful services did the Cincinnati Black Brigade provide before the Emancipation Proclamation?

Before the Emancipation Proclamation, the Cincinnati Black Brigade provided essential services by acting as a support unit for the Union Army. Composed primarily of formerly enslaved individuals and free African Americans, they performed vital tasks such as building fortifications, transporting supplies, and providing labor in various capacities. Their contributions were crucial in bolstering the Union's efforts during the Civil War, showcasing the significant role of Black individuals in the fight against slavery.