Are the Battlefield 1 Expansion Packs Campaigns or just Multiplayer Maps?

I just played Battlefield 1 on PS4 and loved it. I am looking into getting the expansion packs but from the marketing material it is not clear whether these are just new multiplayer maps and weapons or campaigns. I am hoping for more campaigns like the 6 stories in the main game (e.g. "Friends in High Places" or "The Runner").

Solution 1:

The DLC are all pure multiplayer, introducing new maps, guns, and game modes. Unfortunately there aren't any new/additional War Stories.

If you haven't done so, you should still try the Operations game mode, which essentially plays pretty much like the Italian War Story (which uses one of the maps). They also tell small stories and progress over a map, but they're still a player vs player experience.