Flags have been once in a while used as rallying elements all over battles; troopers could gather round their colors for morale

https://kylerzqqt462.rivertonbrief.com/posts/civil-war-flag-etiquette-understanding-proper-display-and-respect

Flags were often used as rallying issues for the duration of battles; squaddies would collect round their colours for morale give a boost to while faced with overwhelming odds.