The way of life of flying flags dates returned centuries, serving as a means of verbal exchange on battlefields

https://wiki-net.win/index.php/The_Gadsden_Flag:_Unpacking_Its_Historical_Significance_and_Legacy

The custom of flying flags dates again centuries, serving as a method of communication on battlefields. They conveyed messages of allegiance and victory, allowing armies to coordinate events and suggestions without verbal conversation.