Arc moved to the imperial capital of the Adrian empire to control the situation. He has to handle it and must gain the recognition of the people.
The first thing he did after entering the imperial capital is to send back the Flatfish puppet troops and one-third of the Mercenary troops back to the Western continent.
They will be having new mission soon.
As for the invasion of the next empire, he would deal with at the start of the next year. It has been nine months in the first year and his plan has finally kicked into full motion. He should take a cooldown period.
After sending the troops back, Arc went on to do some more things Sam asked. The first one is to send the death row inmates to the western continent, they will be forcefully fed the pills of servitude and added to troops.