I would imagine so. It's far harder to attack a town that can be properly fortified, after all.

[Seteth can only sigh at that. It's difficult to keep high spirits in the face of information like this, isn't it? Even emerging straight from a war..... At least in Fodlan, the stakes had been clear. They had understood their enemy, known what would happen if they had lost the fight, and could prepare for the battles ahead. Here, though? Everything is unknown. Their foes, the reasons for their attacks, their true capabilities, what might happen to them all if the Augur falls.....]

But they did fail, at least for now. I wouldn't say that the risk for battle is constant, given this is the first I've seen of them, but I must admit I would feel more confident if we could actually learn about and deal with them permanently.