Flags had been in some cases used as rallying facets throughout battles; infantrymen would collect around their colours for morale

https://cruzbuxy751.solsticebrief.com/posts/the-uses-of-civil-war-flags-from-battlefields-to-museums-3

Flags were in certain cases used as rallying elements all over battles; soldiers may bring together round their colorings for morale aid while confronted with overwhelming odds.