The map was Great Plains. I tried doing a Lakota raid at the beginning, but Sephiroth was faster and managed to get Pikes out... after an engagement I decided to try my luck in Fortress Age, since I was sure I wouldn't be able to beat his army in Colonial. His Pikes end up killing my second TC, and I reach Fortress seconds later he arrives at my main base.
Fortunally I manage to resist for a few more time. After some battles here and there, we get to the final match, where both armies chock against each other. __Sephiroth__ has the best economy and is supported by his native allies, while I have my army powered by mercenaries. Though one of us, seeing it was lost, resigned before it could finish... But it is still nice to watch ;)