Flags were many times used as rallying elements at some point of battles; squaddies would collect round their colorings for morale

https://wiki-mixer.win/index.php/Collecting_Civil_War_Flags:_A_Guide_for_Enthusiasts

Flags had been many times used as rallying aspects throughout battles; infantrymen may bring together around their colors for morale give a boost to while confronted with overwhelming odds.