[Keeper of Dol Guldur]

Exactly! Balrog's legions, legions of Balrogs. Same difference. And maybe a host of a thousand Balrogs was just Tolkienistic writing for host of a thousand Balrog's troops, these distinctions in writing are a problem for me. But it still seems almost clear. And regarding to a Balrogs appearence, "it spread it's great wings of shadow"...wait, because if you recall a balrog is a spirit of fire-cloaked in shadow. The wings could easily be part of it's shadowy covering. Heart of fire, body of darkness, etc... This gives explanation to you anti-wingists as to the wings simply being shadow surrounding it, it is shadow.