Historical examples of flanking maneuvers
In military tactics, a flanking maneuver, or flanking manoeuvre (also called a flank attack), is an attack on the sides of an opposing force. If a flanking maneuver succeeds, the opposing force would be surrounded from two or more directions, which significantly reduces the maneuverability of the outflanked force and its ability to defend itself.
Source: Wikipedia — Historical examples of flanking maneuvers (CC BY-SA 4.0)