Vargr: Military Organization
1. Large scale logistics would be a weak point for any Vargr endeavour.
2. But Vargr are great scroungers, which tends to work out for small units.
3. Neighbouring polities would become quite alarmed, once their intelligence agencies identify hoarding of strategic materials, and not so strategic goods.
4. Especially, organizing support troops.
5. A Vargr defender's primary objective would be to stalemate the advance of an attacker, until the attacker ran out of supplies.
6. The attacker would want to force a quick and decisive confrontation, even if it costs him excessive resources and casualties.
7. The rationale being, it would cost a lot more if the armed conflict was allowed to drag on.
8. Third parties, including corsairs, could take advantage of the continued distraction, and take bites out of the attacking polity.
9. And, these might not even be allied with the defender.