Flags have been no longer in basic terms used in war however also served ceremonial functions, marking good parties equivalent to parades

https://ericksigh824.birchreport.com/posts/flags-as-historical-artifacts-insights-into-the-civil-war-era-2

Flags were no longer best utilized in struggle but also served ceremonial functions, marking impressive situations corresponding to parades, memorials, and militia ceremonies during the Civil War period.