Knights of Honor. It's a good game, a real-time RTS that has a similar set up to the Total War series of games.
The campaign map shows the different regions/provinces, and army movements. Battle view is you directly controlling individual units on the battlefield.
Major difference between this and Total War games is that the campaign map is real-time instead of turn-based. It's loads of fun until you figure out how easy the AI is exploitable.
Good thing is it's all 2D (runs well on toasters), and the art work is decent. Also runs well on Windows 7.
