From the 2e Villains Handbook:
"Sememmon commands the forces of the fortress known as Darkhold. Oveer 1000 Zhentarim reside there under the mage's command. The Pereghost serves as Sememmons military commander.
While Darkhold's public purpose is to be an outpost of civilization in the Far Hills, a rest stop for trade caravans (Zhentarim only), and to facilitate relations between the Sword Coast and Inner Sea, its true mission is much darker.
Darkhold often sabotages trade in the area by strategically importing monsters onto common trade routes. One favorite tactic of Sememmon and his followers is to use wyverns to carry deepspawn creatues (bred in Darkhold's depths) to competitor's trade routes around Darkhold into western Cormyr."
I know there is a listing of equipment for Zhents in the 2e book "Adventures", and I do believe they all wear Full Plate and carry swords, shields and bows (might be crossbows).
In 2e The Pereghost was a LE hm f12. He is the one runnign Darkhold in 3e.
There is a boxed set called "Castles" that has detailed information and maps of Darkhold.