Raiders of Enterone: The Glain Campaign by Chris Gonnerman

Everyone in the town of Darion's Bridge knows about the long-abandoned, ruined fortress known as Grimspire. It stands on a hilltop just a couple of miles from the town, and rumors say that there are extensive dungeons underneath filled with monsters, including many of the walking dead. But now, things have escalated. Orcs and goblins have moved into the ruins and are raiding the local farms and the merchant caravans on the trade road to the nearby Keep. Adventurers are needed to brave the dungeons and end the threat! This adventure was originally written in ink on notebook paper as part of the author's very first campaign in the early 1980's. Dug out of a dusty folder, it's been expanded and polished; even so, this is truly an Old School adventure!