IMO, you are missiong the point of the campaign if you are looking for any story in it at all. The idea of this campaign is to remove the story, to place the battles in no context. In that way the player's emotions are evoked when he must make decisions with little to no context. Without the context, who knows what is right? However, at the end, it is shown that making decisions solely based on strategic value in battle/war can be dangerous, as the context matters.
In other words, this campaign's story is the emotions it evokes in the player, not the plot written into it.