Pigs and Glory is a set of free wargames rules for Viking Saga Campaigns. It is designed to give some context to period battles.
Campaign Rules
Napoleonic Campaign Rules
Dale the Wargamer offers a set of Napoleonic Campaign Rules to be played on a Risk board.
Link.
Napoleonic Campaign Rules Using Risk
Dale the Wargamer offers a set of Napoleonic Campaign Rules using the Risk board game.
First Man In Rome Campaign Rules
Jim Naughton has written a set of campaign rules for DBA
about the last stage of the Roman Republic. In it, each player will represent a Praetor, the second rank of Roman senior magistrates, and the lowest rank empowered with Imperium, the power to command Roman armies and exercise governorship of a Roman province. Eventually some praetors will advance to the rank of consul, and occasionally dictator. Ultimately the goal is to amass sufficient prestige to stand unchallenged as First Man in Rome.
Hat Tip: Rich Baier
Alexius – Byzantine Empire Campaign
From the Perfect Captain comes Alexius, a campain game set in the Byzantine Empire in the time of the Crusades.