The slogan to prevent the Sea Race's invasion has been chanted for countless years. Regrettably, at the port where the Second Infantry Corps is stationed, there hasn't been any trace of the Sea Race for hundreds of years.
Since the birth of Alpha Kingdom, there has never been an invasion by the Sea Race.
The heavily fortified Sea Border Defense Line from the past has long been abandoned, the remaining duty is to fight against pirates.
However, that is primarily the job of the Navy. Their dry-land soldiers are usually only maintaining port order.
In reality, there isn't much order to maintain. The port where the Second Infantry Corps is stationed is the Dalton Family's territory, and they are capable of managing their land.
Now, they've been reassigned here to deal with the affairs of Qiaomu County. Other than due to close proximity, the main reason is that they are the least busy.