Piquet's campaign game Theater of War

Santa Clarita Wargamer: Review:

The post is worth reading for more detail of how the system works--he uses an ACW campaign as an example but you could equally well use medieval, or WW2.

Summary
Theater of War lets you run a campaign, organize the armies, generate the battlefields, and keep track of victory. Like most Piquet-based systems, the sequence decks generate a lot of uncertainty about what the future holds for your little Battle Groups.
You might want your BG to move into the light terrain outside Frederick, Maryland, but until you get that Light Terrain Move card, it's not going to happen for you. Just like in real historical campaigns, your armies and subordinate generals don't always react right away to your orders and desires.
Do you concentrate on marching your armies to execute your masterplan or try to build up your hand to improve the Battle cards you have available in case Stonewall Jackson is lurking in ambush behind that mountain range? Is that Battle Group in front of you a screening force or the Army of the Potomac on the move?
Even if you're not a Piquet player, the cards supplied with the rules allow you to customize each campaign deck to reflect the strengths and weaknesses of the opposing forces. With some tweaking, TOW can be modified to give you an excellent campaign system.
If you are a Piquet player, the rules allow you to fight campaigns with any army from any Piquet supplement you own. This is a must-have for the Piquet library.
The production values are decent. Some of the type is a little small and you won't see any interior color pictures, but the book is jammed full of typo-free tables, charts, and rules. There are some black and white photos of nicely painted miniatures. The package includes sample battle maps, campaign maps, and sheets of Campaign Sequence cards you need to cut out to play with.