Flags were no longer in simple terms used in combat but also served ceremonial functions, marking substantive events similar to parades

https://codyviqa225.northcrestbrief.com/posts/flags-as-historical-artifacts-preserving-the-legacy-of-the-civil-war-2

Flags were not in simple terms utilized in conflict however additionally served ceremonial reasons, marking marvelous events corresponding to parades, memorials, and military ceremonies throughout the Civil War period.