@ Midnight: My memory of when each movie begins and ends is fuzzy. I had thought that the scene I described (Gandalf chasing away the Nazgul who are attacking the Gondorians, who are fleeing Osgiliath) was in the Return of the King. I could very well be wrong.
I also believed Lotr was a trilogy until I opened my uncle's copy which at the begining of the Fellowship as a Note on the Text. The first paragraph states: "The Lord of the Rings is often erroneously called a trilogy, when it is in fact a single novel, consisting of six books plus appendices, sometimes published in three volumes."
I think he's referring to the scene where Gandalf shines a beam of white light toward the attacking Nazgul to allow the retreating Gondor army safe passage back to Minas Tirith (pretty sure I spelled that wrong?).
I *think* that scene is at the end of TTT. Said army is beaten pretty bad in RotK.
The mercenary / ghost army comes much later, in RotK.
So, technically speaking wouldn't that make the LoTR a sextet as it is 6 books?