I think that the Uruk-Hai(Isengarder I believe) were more powerful then normal orcs say the ones up North(Lugburz). I really dont know this for sure, but their is a good chapter in TTT "The Uruk-Hai", that the two "breeds" work togehter.<BR>I dont know if the books go into detail about how the Uruk-Hai were born/made, I cant think of any. but Saruman created them to be in his army in his attempt to capture the ring before Sauron.
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