The lifestyle of flying flags dates again centuries, serving as a way of communique on battlefields

https://wiki-planet.win/index.php/The_Evolution_of_the_American_Flag:_A_Story_of_Freedom_and_Sacrifice

The way of life of flying flags dates to come back centuries, serving as a means of communique on battlefields. They conveyed messages of allegiance and victory, permitting armies to coordinate events and processes without verbal communique.