Flags have been in some cases used as rallying factors for the time of battles; troopers may assemble around their colours for morale

https://collinielv260.talesignal.com/posts/collecting-civil-war-flags-a-guide-for-enthusiasts-and-historians-2

Flags have been occasionally used as rallying elements for the duration of battles; soldiers would accumulate around their colorations for morale improve whilst faced with overwhelming odds.