The easiest escort is probably the one involving Mercedes.
First, complete the quest "Of merchants and monsters" to clear the mine of all the monsters.
Then accept the escort of mercedes (on the board of the gran soren inn) and head to the mine.
Before and after the mine, if you stay on the road, you will only encounter goblins and hobgoblins, knowing that Mercedes can defend herself with her sword. So it will be a piece of cake, and a quick one ;)
Note that just in front of gran soren, I encounter a convoy being attacked by goblins... and suddenly attacked by a griffin.
I don't think it is part of the escort quest because the griffin appears sometimes after a certain point of the story, but if it is, don't worry cause it will flee rapidly, doing very limited damages.