During the American Civil War, a brigade was a military unit typically composed of three to five regiments, which were groups of soldiers. Brigades were part of larger formations, such as divisions and corps, and played a crucial role in battlefield tactics and organization. Each brigade was usually commanded by a brigadier general and was responsible for specific missions during battles. Brigades were often named after their commanding officers, geographic locations, or notable figures. For example, the Iron Brigade was known for its fierce fighting and distinctive uniforms. The structure of brigades allowed for more flexible and effective troop movements, contributing to the overall strategy of both the Union and Confederate armies.