King Leonidas made the decision to mobilize all the units and kill all the demon wolves. Since only a few combatants also need to protect the children and women, they three thousand combatants that could fight outside will be reduced to half of that number.
The defense of the capital lies on each combatant to kill at least four or five demon wolves. The numbers might be too large to a single combatant but the beastkins are not a race that knows fear. The first to move are the fox clan as they utilize their mystic arts to separate the demon wolves attacking.
The mystic arts that the fox clan used is a way of misdirection. King Leonidas planned to use their Mystic Fog so that each combatant could kill one demon wolf at a time. Although that would also mean that the fox clan would need to dedicate their entire focus on keeping the Mystic Fog active.