Flags had been once in a while used as rallying aspects at some stage in battles; soldiers might collect around their colours for morale

https://andersonfowi396.novacrestiq.com/posts/civil-war-flags-in-reenactments-authenticity-and-representation-3

Flags were now and again used as rallying facets at some point of battles; squaddies might assemble round their colours for morale aid while confronted with overwhelming odds.