If you're looking for the novel, check the outlines for the novels that appeared from 1986 to 1989.
If a TSR in-house writer was on it, he likely simply changed the names and settings, and still got it out.

I have my theories, there, too:

http://www.dlnexus.com/products/review/381.aspx

http://forgottenrealms.wikia.com/wiki/D ... n_Moonshae

http://forgottenrealms.wikia.com/wiki/Horselords



Might just be a brainfart, but I think it's more likely than an entire lost manuscript, for several reasons.

Interesting theories. You never know! :)

-Havard

Some of the ideas might seem far fetched - but especially with the Dunador module,
I would be very surprised if this wasn't simply BM with the labels removed. ...Or, at least, an adventure inspired by Dave Arneson's writing.

With the novels, I think Horselords is, for many reasons, the most likely candidate, but somehow I have difficulties to find my Arneson there yet.

I think somebody wrote a more detailed history of the Dunador setting; you might want to track that down.

I am sorry I can't be more of a help these days, but I got my plate full with the LFC, and something about an inn at a bridge...


As to Horselords, have you read the Gygax novels? The Bakluni from WoG are essentially the Horselords, and they, in turn,
were spawned through Arneson's Peshwah. I think there was even a C&C faction out there that played a Horseclans-style (now, I mean another novel)
faction, but I don't remember which one.