The 2nd inner layer will consist of Royal knights. When they are in the formation, their strength will rise significantly.
And the innermost layer consists of Generals, protecting the King.
And at last, with the palace as a base, there will be a team of Archers lined up at the back, behind the King.
Originally, they won't be able to attack until the enemies broke through the center layer but considering their current strength, the formation will be packed together.
So, their range will exceed that of formation and can attack the enemies, right from the beginning.
The most troublesome is the king, who was also an Archer.
There's no way to break this formation other than surrounding them from all sides. However, to do that, we might need more than sixty thousand soldiers.
Not to mention, since they are laying the formation within their city, it won't be possible to surround them even if we have the numbers.