[Kuruharan]

While the Nazghul might be invisible, their swords are very much real.

Hmmm…for some reason I seem to have some vague recollection of some reference that Nazgul had to have a visible form to affect the visible world i.e. they had to have a visible form to hold a sword. I might be mistaken in this recollection.

In the Two Towers, doesn't Faramir mention something about treachery having been Gondor's greatest foe in the long wars with the Enemy?

Hmmm…there definitely might be something to this, although we still have the two year siege to ponder.

Since Sauron is still rebuilding out of Dol-Guldur (if my memory is correct), it makes sense that the Lord of the Nine would not have such powerful resources at his command.

Which is exactly the reason why he couldn’t conduct a two-year long formal siege in the conventional sense.

I would also like to bring up a semi-new point against the idea of a haunting/guerilla campaign: that guerilla warfare does not win wars, or even sieges, by itself.

A good point. However, my theory always encapsulated a final attack by Mordorian forces that were significant enough to quickly overrun the weak garrison already crippled by two years of Nazgul inspired malaise and hit-and-run attacks by small forces. I find Břicho’s suggestion of treachery to be particularly appealing as a potential end game here.

When do we actually see the forces of the Enemy using such tactics in instances of warfare that are more than just skirmishing? And what types usually do this? The Haradrim would seem to be most in-line with this tactic, while Easterlings and Orcs seem to be more of the backbone infantry types of a traditional army. I cannot see the Nazgul being able to deploy these troops, especially in a desolate land such as Mordor, in such a fashion. It seems to go against the very way the Enemy fights in every other major confrontation.

I’m afraid I disagree with you on this, particularly on the use of orcs. They are in many places portrayed as raiders and I believe that this was the area of warfare in which orcs excelled. They are not such great stand-and-fight soldiers, by and large.