The intensity of the war is increasing and has reached a point where the fortress can barely hold on.
Louis is different from the other reinforcements.
Other reinforcements need time for long marches.
But the Birch Forest Fortress cannot be directly teleported to.
A crucial location like that, even the teleportation arrays from the Imperial Capital, aren't allowed to directly teleport there.
They must teleport to a nearby town, and then have the soldiers walk over.
The central command has the ability to control the entire realm, but it can't directly strangle the throats of key locations.
Otherwise, if the central command was suddenly blitzed and captured, they wouldn't even be able to retreat to defend.
On this, a certain Tunisian who was blitzed by giants in a what-if line has something to say.
In short, the situation at Birch Forest Fortress is too urgent, and there's not much time to wait for reinforcements.
