The standards of defeated enemies are highly prized as trophies, so an army will collect as many as it can, drawing great satisfaction from their enemy's shame. If a fleeing unit is run down by an enemy unit, or if a unit is destroyed in combat by an enemy unit, its standard is claimed as a trophy.
Standards claimed in this way are worth bonus Victory Points at the end of the battle. Once a standard has been lost in this way, it cannot be reclaimed.
Note that if a unit is destroyed by any means other than being run down whilst fleeing or being destroyed in combat (by enemy shooting, for example), its banner is not claimed by the enemy as a trophy of war.