Beyond the Saale is a set of campaign rules for the Seven Years War.
campaign
Flames of War Desert Campaign
Running a “campaign” can add context and interest to a miniature wargame. Here’s a Tobruk Desert Campaign for Flames of War.
Valley of Fire Northwest Frontier Campaign
Valley of Fire is a free campaign system for the Northwest Frontier. The authors write:
This is a fictional colonial campaign set in the Northwest Frontier during the late 1880s. A British fort is under siege and a relieving force has exactly one month to break the siege! The villages in the valley and mountain passes go into revolt, adding more and more foces to the siege and to block the British advance. The system features hidden movement, is of moderate complexity, and is designed to be run with or without a referee. The PDF contains rules, counters, a planning map, and log sheets.
Napnuts Peninsular Campaign Rules
The Napnuts site has a set of rules for conducting a Napoleonic Peninsular campaign. The Peninsular Campaign makes for a good campaign because of its relatively limited scope.
Master of the World Campaign
Basement Generals has a general miniature wargaming site with an extensive victorian science fiction section featuring battle reports of their Master of the World Campaign, plus photos of their figures and models.