What if Gandalf the White killed the Witch King?

[Moonraker]

Originally Posted by Inziladun

Sauron's forces were not tied to a specific field commander, even one as singular as the Witch-king. It is said more than once in the books that it was Sauron's will that drove his armies forward against all doubt and fear. Even if thousands of them had seen the WK's fall, they would not have abandoned the battle.

I did not say Mordor would just surrender as soon as the Witch King fell, but I would have expected the army of orcs to flee at the coming of Gandalf, slayer of the Balrog of Morgoth (to my mind an opponent almost level with Sauron), demolisher of Saruman, and the bane of the Lord of the Nazgul. There would still be the armed men, and trolls, and the Mumakil to deal with, not to mention the other eight remaining Nazgul.