transitive. To fight in war or battle under the command or in the service of (a sovereign, commander, etc.); to do military service for (a…

intransitive. To serve or be faithful to (a person); to follow (a person's banner) in battle. Obsolete.

A piece of stout cloth, attached by one side to the upper part of a long pole or staff, and used as the standard of an emperor, king, lord, or…