The next "waypoint" on the journey is a place called Falcon Hill. It is the site of an old outpost, placed where the road to Coriovallum crosses the Geul River. The Geul is small, and easily forded over it's whole length, but it leads into wilder country, away from the road.
Countryside with old magic associated with it- fairies, spirits, and monsters, the northern fringe of the great forest called the Ardennes. It is rarely traveled.
Falcon Hill itself, though, has been occupied many times during a long, long history. Its stories are ancient by even Elven reference, though maybe not in the eyes of Treants. When Humans and Elves were young and wild, before they tamed metal, they collected Flint in the caves below the hill. Millenia later, the Romans would build a fort on the hill to watch the road.
The fort is ruin now, destroyed in the wars with the Huns, but Leanna and Brennus would know that it is rarely an empty ruin. Sometimes, it's Huns. Just as the Huns often keep watchers close to the bridge at Mos Trajectum, they occasionally keep a patrol at the ruins. But there is more. An ancient place like this has a way of calling out, and there are often dangers in the caves and ruins on that hill that would prey on Orcs just as quickly as they would on Humans or Elves. That is one of the reason no one has even tried to hold the hill for very long, since the fort was destroyed.
It does have a way of making everyone feel watched. But if they keep on the road, and then keep to the bank of the Geul river, they should come no closer than a quarter mile to the old stones, and far older caves.