Four great fortresses essentially define the border between Aundair and Thrane to the west and Breland to the south. Wrogar Keep, Tower Valiant, and Tower Vigilant stand along the Thrane border, while Vanguard Keep guards the plains between the Blackcaps and the Eldritch Groves, near the border with Breland. Each fortress has a high watch tower surrounded by magically fortified walls and less obvious magical defenses.
A brigade of about 700 soldiers garrisons each keep, with the equivalent of a tiny village helping to supply the soldiers with food, arms, and repairs. The soldiers include standard infantry, archers and wandwielding specialists, and at least one unit of cavalry or dragoons (mounted infantry).