The Kandrian Empire mobilized everything it could in the day that it had before the Beast Incursion reached it. Strategists of the Royal Army, the border patrol force, and the Martial Union got together and chalked out elaborate defensive strategies.
None of the existing standard strategies were designed to handle a seemingly endless wave of monsters and beasts. Thus, the military strategists chalked out a whole new plan for the Kandrian Empire to deal with the incoming beast tide.
The plan was simple. They would adopt the common positional strategy that most human polities naturally ended up adopting—a spectrum of distribution of Martial Artists along the battlefield where Martial Sages would be the furthest away from the Kandrian border, and would be positioned westward from the Kandrian Empire to intercept the beast tide most directly.