Uruk-hai:The Uruks first appeared out of Mordor in TA 2475, when they assaulted and managed to conquer Ithilien and destroyed the city of Osgiliath. The Uruks in the service of Barad-d?r used the symbol of the red Eye of Sauron, which was also painted on their shields.

Uruk-hai (for short, Uruks) were brutal warriors of Middle-earth, and the strongest breed of Orc.
In The Lord of the Rings, the term Uruk-hai refers chiefly to those bred in Isengard, and in one context are alternatively called Isengarders, while Uruks from Mordor are called Black Uruks or Uruks of Mordor.