Intro. The Pledge of vengeance 2

At the beginning of the war, the Silver Arrow had sent Bifrost reinforcements, but sadly both the Silver Arrow and Bifrost were defeated repeatedly by The Dark Armor troops led by the Dark Prince. Cyrupps and the reinforcements of the Silver Arrow were almost demolished when urgent additional reinforcements were mentioned in Pandragon. The thing that made the crisis resolved was not the reinforcements from Pandragon, it was the short message from the Geisir Empire.
“The Death of the Emperor”
A power struggle within the empire arose after the sudden death of Carls, the emperor of Geisir Empire and father of the Dark Prince.  The death of the emperor was like losing the control of the empire because there were a lot of powerful local lords in the empire. 
Eventually, the Dark Prince had to come back to the empire with his loyal guards and the empire troops in Cyrupps had lost their leader and important army corps. While the Dark Prince sorted out the mess in the empire, the Silver Arrow did not miss the chance to stage a counterattack. The Silver Arrow mobilized tremendous military forces and defeated the empire troops which had no one to command them.
When the Dark Prince returned to the battlefield, almost half of the occupied territory and armies were lost. They all would have been destroyed if the Dark Prince did not return to the battlefield. After the return of the Dark Prince, the Dark Armor was prepared for the new battle with the Silver Arrow.
In the year 1202, Esgel Calendar, the Dark Armor, and the Silver Arrow had a historically huge battle in Greates. It is the Battle of Greates which changed the whole history of Antaria, and the Dark Prince showed his new battle formation “Echelon” for the first time. 
Before echelon formation showed, most of the armies had been formed in a hollow square. Troops were allocated in a square shape to defend attacks from everywhere, and the troops inside were reinforced if any side of the outer square was damaged. It had been a typical strategy before the appearance of the Echelon Formation. 
The echelon formation was specially designed for destroying the square formation.
As a result of the Greates Battle, most of the Silver Arrow’s royal family, generals and leaders were buried in Greates by this new strategy by the Dark Prince.
The few survivors of the Greates Battle had run away to the north end and west end of the continent. The Dark Prince was about to gain supremacy and unite the Antaria continent. 
However, the Dark Prince’s airship crashed, due to mysterious mechanical failures. After his disappearance, his close friend Beradin, the Chandler of the empire, seized the power of the empire and ruled the whole empire as regent.
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