The Chivalry Mod doesn't have a campaign yet. It is just at custome battle type of stage with a selection of the planned units made. It gives a good impression for how it should be when it's done ( good! ) but it will be a while before a campaign is available. That involves a lot of units, a lot of extra scripting and text editing, and masses of balancing and bugfixing. It WILL get done, I am sure!