Flags have been many times used as rallying issues during battles; infantrymen might bring together around their shades for morale

https://mariohczd240.nexorafield.com/posts/the-many-faces-of-civil-war-flags-an-overview-of-types-and-designs-2

Flags had been in many instances used as rallying elements at some stage in battles; infantrymen might gather round their colours for morale fortify while faced with overwhelming odds.