Carl's force was not very large in number. The number of troops that the Laurel Alliance, which unites the eastern part of the empire, can mobilize is enormous. However, because the war broke out so suddenly, there was no conscription, and most of the troops were formed as standing forces.
Additionally, many troops had to be deployed along the border with the mountain range to stop the monsters that emerged from the Celle Mountains. Moreover, Carl could not withdraw too many troops when Goban's forces had to surround and blockade Jihan. It is also because of this background that the Laurel Union's forces could not be divided into three.