7. The Seven Fathers ( timing of 'numbering' non-accidental 
) and Comments about Dates: When did Tolkien First Transcribe Materials about Azanulbizar
I've reserved a special place for that battle because it implicates and crosses over with/unifies:
a. The Mythology and The Silmarillion as it intersects with Ring Lore (not ring lore), in Eregion (West Gate) and Azanulbizar (East Gate) and the migratory patterns and grudge matches of -- both the Orc-and-Dwarves over the pre-Hobbit history. I suspect I'll unearth something dates in the various manuscripts that may assist to pin down the item of discussion about when the ring and the Ring first were a "Ring of Fire" in the Prof's imagination and head. Perhaps Sauron visited the Professor in a dream from The Void.
Just reading atm. I'll be back to edit this post
[Edit]Basic gist--Dwarves are in the Silmarillion. Originally, two lines, not seven. And, I'm not going to lengthen this post, as I haven't been able to find much about the fabled Battle. I've found resolution to satisfactory levels in Numenor, (see downstream), to make the same argument. If I find a Dwarvish treasure trove, I'll be back to this post[/Edit]