I really enjoyed the opening. I thought it was very well done, but as others said could be extended to focus more on other theatres of conflit.

Personally I think that you might as well skip all the battle scenes towards the end and just focus more on the scrolling map. It is somewhat difficult to capture the heat of the battles anyway and to be honest we all know what it does, but the opening really made me want to dig right in and control one of these nations to utter supremacy.

It's good already, don't be let down by (constructive) criticism, but like many great things the first draft is not the final draft!

I hope to see more.