The military competition helps to check the individual strength and the military tactics of a kingdom. It gives the opportunity to shine to everyone who participates in it, so the possibilities of talents been wooed over to another kingdom are pretty high. For this event, most kingdoms pull out the best of their forces and move to the capital without fear since it's forbidden by the empire to attack a defenseless kingdom during this period. That way subsidiary kingdoms dare not plan sneak attacks against each other once the main forces of a kingdom have left for the exercise.
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"what the hell is this?"