Going back in time a bit.
In the opposite direction, inside of a forest.
The crown prince's group were currently camped out in the middle of this forest.
After they had left Dungeon City, they had also met up with a group of guards and had quickly made their way away from that city.
However, instead of heading to the closest town like the second prince's group had done, they had gone to this forest.
That was because they had already set up a proper fortress in the middle of this forest.
This was something that had already been set up before the crown prince's group had set out to Lin Fan's dungeon town.
This fortress had been created for a different reason, but it was where the crown prince's men had gathered. Since it was also close, the crown prince decided to send men from this fortress to the dungeon town to take care of this business for him.
Now that they had finished, they naturally returned to this fortress.