This was the first campaign I wrote set in the World of Orbivm, made in summer of 2006. I think it’s pretty good, personally.
The plot of this campaign revolves around the conquest of the Lavinian province of Silvia by the Marauders, and the plight this put the tribune of Silvium, Caius Regilius, in.
To play this campaign, download the Battle for Wesnoth and then go to the “add-ons” menu. Find “Fall of Silvium” in the list and download it. Then, when you restart Wesnoth, go to the “campaigns” menu and Fall of Silvium should appear at the bottom.