Hi,

ich play on the Klingon Side the Campaign. But i dont know what i must do to win the game?
I win all Missions but i lose the War :D

And how long is a Campaign?

Expect to spend about 4-5 hours per campain and thats if you are already well versed in the game, I think back in 2000 when I first played it I spent about 18 hours straight beating the game the first time.