Castles: The Northern Campaign is a video game published in 1991 on DOS by Interplay Productions, Inc.. It was also released on Amiga.
This add-on for Castles feature a new campaign in the North against the rebelling Picts. The game is enhanced with new graphics, economics, combat features (vikings, archers and more) and troop training.
Castles: The Northern Campaign is an addon for Castles, you will need the original game to play.