Flags had been in certain cases used as rallying features at some point of battles; infantrymen may gather round their shades for morale

https://zionitwe861.clearminster.com/posts/the-legacy-of-civil-war-flags-symbolism-and-design-throughout-history-2

Flags have been regularly used as rallying points at some point of battles; troopers could collect around their colorations for morale reinforce while confronted with overwhelming odds.