The 3rd Barbarian tutorial map has a design glitch: It is possible to circumvent the red player without any fight! To do it just build fortresses to the north east. When you reach the border, build one more fortress. It will give you enough new land BEHIND the border to build more military buildings there! And roads can be built through the snow above the red border so that the buildings can actually be constructed. As soon as you have a military building behind the red frontier, the event of the fleeing general and the defecting soldiers will be triggered. This should surely be fixed as it totally destroys the story. Perhaps by adding one more red military building in the northeast occupying the space where blue player can build behind the border for the red player.
Released in build16-rc1