In banishing Eomer, Wormtongue also essentially banished the entire army (which was his goal, so that Rohan would be weak for Sauruman). The small band that Aragorn & co ran into weren't his entire force.

And Aragorn tells Theoden that if he calls Eomer - either 300 or 3000 - riders will come with him.

Gandalf rides off (telling Théoden et alia to look for him 3 days hence at dawn) to find Éomer and gather what scattered bands of fighters he can find. Presumably Éomer was sulking in Northern Rohan with a lot of the disaffected army.

In banishing Eomer, Wormtongue also essentially banished the entire army (which was his goal, so that Rohan would be weak for Sauruman).

Aha! That makes sense, now that you say it.

And Aragorn tells Theoden that if he calls Eomer - either 300 or 3000 - riders will come with him.

I don't remember that, mostly b/c I haven't re-watched TTT all the way through yet -- only caught the end at the gym, and I'm still working my way through the extras on my LotR EE DVD (which I just got this Xmas).

In the novel, Eomer was traveling with a troop of about 100 when he ambushed the orc troop that had Merry & Pippin. He isn't banished in the novel, either, and fights at Helms Deep with Aragorn and Theoden; the rescuing army with Gandalf is *memfault* and the men of the Westfold, who had been defeated and scattered in the same battle that killed Theodred (the king's son).

In the movie, Eomer must pick up the men of Westfold, because there's WAY more men with him at Helms Deep than he had when he met Aragorn.

I believe it's 3000. Yeah, basically, it's like if Truman told MacArthur to go away, and MacArthur went away by driving across Missouri, picking up disgruntled veterans as he went. So, when called out of exile in Canada, MacArthur came zooming in with a lot more people than he'd originally left with.

Not that Eomer would ever smoke a corncob pipe, or that MacArthur would ever, you know, obey his properly-appointed leader.

they're the original 9 kings of men?

There were some kings. It's to be taken that while Strider's kin were yukkin it up in Atlantis, there were a bunch of petty kings rolling around Middle-earth, and they were the ones that got corrupted. So when Atlantis did the Atlantis thing and foundered, and Strider's kin came along refugee-like to create what is now the kingdom of Gondor, there was effectively a huge leadership vacuum in Midle-earth, due to several of the major mannish kings being undead.

And Elendil's your uncle: kingdom and 3000 years of genetic hegemony.

the rescuing army with Gandalf is *memfault* and the men of the Westfold

Memfault would be Erkenbrand. And since that's the only thing Erkenbrand gets to do in the whole book, one doesn't particularly mind allowing someone cooler to be the guy who comes zooming in to the rescue.

t wallows in the joy that is a whole bunch of Tolkien-geek Buffistas

Atlantis = Númenor.

There were some kings. It's to be taken that while Strider's kin were yukkin it up in Atlantis, there were a bunch of petty kings rolling around Middle-earth, and they were the ones that got corrupted. So when Atlantis did the Atlantis thing and foundered, and Strider's kin came along refugee-like to create what is now the kingdom of Gondor, there was effectively a huge leadership vacuum in Midle-earth, due to several of the major mannish kings being undead.

Not entirely true, this. The corrupted kings that Sauron gave the rings to included 3 "Black Numenoreans". While the Numenoreans were living in Atlantis, they also sailed to Middle Earth and established colonies. (Originally, their settlement was fairly benign, but later, they got greedy and dominated the non-Numenorean men who were already living in Middle Earth). (There's a whole tangent that can go on about the different tribes of men, but I'll pass th is time).

Anyway, as the colonies in Middle-Earth were established, some of the greedier Numenoreans in Middle-Earth became allied with Sauron, who at that time was not in flaming-eyeball guise. Most of them lived in the south and were centered around Umbar, which is where the black pirate ships that Aragorn hijacked in ROTK came from. Three of these "Black Numenoreans" received rings of Men, doomed to die. Shortly after the forging of these rings, Sauron created the One Ring, which was the starting point of the war that we saw at the beginning of FOTR. At that time, the Numenoreans sailed to Middle-Earth and captured Sauron (their army was immense), and dragged him back to Atlantis. In time, though, Sauron became an advisor to the King, and led to the whole Atlantis capsizing portion of the tale. Sauron himself was caught in the flood, and afterwards could only be seen as the flaming eye.

All that to say "yes" to the first question.