Flags have been infrequently used as rallying points at some point of battles; soldiers could acquire round their colours for morale

https://arthurjbzo517.ironwoodscope.com/posts/flags-that-changed-history-the-stories-behind-famous-civil-war-banners

Flags had been sometimes used as rallying features at some point of battles; squaddies may accumulate round their colorings for morale aid when confronted with overwhelming odds.