Flags have been commonly used as rallying points all over battles; troopers could gather round their colorings for morale

https://damienqulw756.laurelcurrent.com/posts/craftsmanship-in-focus-the-art-of-making-reenactment-quality-civil-war-flags

Flags were routinely used as rallying elements all the way through battles; squaddies would bring together around their shades for morale aid whilst faced with overwhelming odds.