The Total War series blends a grand strategy map, complete with cities, armies and realistic continental landscapes, with real-time battles that feature thousands of units clashing into each other. Each entrant into the series takes on a different period of history, but the best out of all of them is Medieval 2. Set on the entire European continent, with North Africa and the Middle-East as well. Pick a nation such as England, France, or the Byzantine Empire, and conquer your enemies.
Whilst you manage your trade, your royal family, and your settlements on the big map, you can maneuver your armies around, recruit and handle spies, and spread your religion. And if the leader of your religion calls for aid, then you better show up otherwise it could be trouble on the world stage.
Start a battle, whether on open field, besieging a town or defending a castle, organise your army and pick your formations. Crush your enemy with cavalry charges, stand strong with walls of interlocking shields, or defend your walls with arrows and boiling oil. Total War games have two sides, and both sides are incredibly fun.