This suggestion has come up already multiple times and its gotten support every time. Can barbarians not have bonus movement on tundra. Tundra is not rough terrain, they do not need to move 4 spaces, or 8 for horses. It makes starting on tundra even more impossible because as soon as 1 barb finds you, all the neighbors rush over. They move faster than your soldiers and the starting pathfinder is useless at fighting back
Also barbarians on camps are attacking, I don't know if that is on purpose or not