Flags had been often times used as rallying issues throughout battles; infantrymen would acquire around their shades for morale

https://ericksigh824.birchreport.com/posts/flags-as-historical-artifacts-insights-into-the-civil-war-era-3

Flags have been many times used as rallying issues right through battles; infantrymen would acquire round their hues for morale support when faced with overwhelming odds.