Scourge Holdouts

The Scourge Holdouts or Scourge Remnants are the remains of the former Undead Scourge. After the fall of the Lich King, most of the controlled scourge went rogue after Bolvar Fordragon became the new lich king. This resulted in most of the major scourge holdouts to be absorbed into the ranks of the forsaken, or go into hiding to form small resistances against their enemies. Most notable Scourge holdouts are located in parts of the Plaguelands, Northrend and small groups of scourge located in Tirisful Glades still waging guerrilla warfare against their forsaken enemies.

Formation.
After the Scourge Empire collapsed when Arthas Menethil was slain and Bolvar Fordragon taking his place during the Assault on Icecrown Citadel, the remains of the scourge factions started to dissolve or went into hiding planning their next move, some managed to find their way into the ranks of the forsaken which is the case for the Val'kyr.

The Scourge that remained formed their own hideouts all over northern Lordaeron and Northrend, one of the most notable was Scholomance. Which was taken over by the Cult of the Damned, until it was cleared out by adventurers.

Notable battles (Feel free to add your own battles here)
Most of the groups of Scourge waged guerrilla warfare against the living and the forsaken in the Plaguelands and Northrend. Some of these battles were the result of Alliance and Horde clashing and others were small raids, most notable battles are........
 * Battle of Andorhal- The battle of Andorhal was the result of Alliance forces lead by Thassarian clashing with Forsaken forces lead by Sylvanas WIndrunner for control over the Western Plaguelands, Scourge Forces lead by Araj the Summoner attempted to take the city but were both defeated by both forces resulting in the Forsaken winning the battle with the use of Val'kyr.