Flags have been sometimes used as rallying features in the time of battles; soldiers would acquire round their colours for morale

https://emiliocwye754.valoradigest.com/posts/the-evolution-of-civil-war-flags-from-battlefield-to-display-case

Flags had been in many instances used as rallying aspects at some point of battles; squaddies could acquire round their colorations for morale give a boost to while faced with overwhelming odds.