My ally was Napolean, we started out by each building our forts on eather side of the one crossing. While he build an army i built a wall. We domminated most of the game narrowing it down to 2v1 by attaking Fredrick while his army was at his fort away from his town, then destroying his fort. We hit trouble when henry attacked my defences and where lucky only to lose my wall, 2 outposts and most of our armies. Then counterstrked and made Henry surrender.
For installation put the file in C:\...\My Documents\My Games\Age of Empires 3\Savegame
Special thanks go to RF_Gandafl for making the map.