Flags had been sometimes changed within the area; soldiers might upload patches or symbols to symbolize victories or losses that

https://arthurjbzo517.ironwoodscope.com/posts/the-uses-of-civil-war-flags-from-battlefields-to-museums-2

Flags have been often changed in the container; troopers may upload patches or symbols to symbolize victories or losses that marked their unit's trip thru battle.