Each kingdom inside the Union had its own extraordinary regimental flags at some point of the Civil War

https://deanrshx384.summitviewdaily.com/posts/the-evolution-of-civil-war-flags-from-battlefields-to-modern-reenactments-3

Each kingdom within the Union had its personal uncommon regimental flags at some stage in the Civil War, reflecting nearby pride and distinctive histories tied to their participation within the conflict.