Drunk Shiro?
With their short fight at the border, the rest of the journey was rather peaceful since no demon guards even approached them which made sense considering that they were already past the border.
Compared to the southern border, the skies of the eastern border seemed much darker with quite a large wasteland that had signs of battle which accumulated over the years.
If they continued to drive for another 3 hours, they would reach the first small scale city since the eastern borders were much bigger than the southern borders. While the southern borders had width, it didn't extend too deep into the demon continent.
For the eastern border, it was roughly twice as big as the southern borders.
Naturally, the centre is the biggest area, but it wasn't a concern right now since they would be conquering the eastern border first.