Brill was a small human village which was infected during the scourgeattacks on Lordaeron. It was then later taken by the Forsaken but not for long. Shortly after Trolman restrored the Forsaken residents to their living selves with Pylon magic by the Nerubian known as Spiderling and jailed their leaders, Sylvanas Windrunner and Varimathras to avenge his older dead brother Lord Garithos. With the scourge infuence on the Plaguelands (Tirisfal Glades, Western Plaguelands and Eastern Plaguelands) gone, the lands themselves healed in time.
Later Brill was taken a dark night by the Grouse forces. Unpleased by this, Trolman despatched a single regiment and defeated the invadeing Grouse. As of yet, the consiquences on Brill are still unknown. Maybe Trolman rebuilt the village, or maybe he removed it from existance.