Flags have been from time to time used as rallying elements in the time of battles; infantrymen could bring together around their colorations for morale

https://archereiuj636.clarionvale.com/posts/flags-of-valor-the-significance-of-civil-war-flags-in-american-history

Flags had been every now and then used as rallying points for the period of battles; squaddies would acquire around their hues for morale help whilst confronted with overwhelming odds.