Hunted cow has a host of games in this genre. I have all of them and they are all entertaining in their own right.
But this is my favorite. It is easy to learn and the campaigns are expansive. It is also challenging without being frustrating.
I prefer it to their larger and more complex Gettysburg game for the iPad- although in fairness my old iPad is a bit overwhelmed by that one and it lags.
I recommend all of their games in this field but this one is currently my favorite. I cant wait till the next of these games is released. If you like this game then you should also look at the Civil War lineup and Red Coats and Rebels. Gettysburg and Russian Front are considerably larger and have enormous single battles to control. I would probably appreciate them more if I had an upgraded platform to play them on.
Tortee Bear about Peninsular War Battles Gold