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

https://wiki.fc00.ru/index.php?title=From_Fire_Departments_to_EMS:_Honoring_All_Our_Community_Heroes_with_Flags

The tradition of flying flags dates returned centuries, serving as a way of verbal exchange on battlefields. They conveyed messages of allegiance and victory, allowing armies to coordinate actions and recommendations with no verbal communication.