Campaigns have never been the biggest focus of the Battlefield franchise, but that hasn't stopped the series from having some great single-player modes over the years. The first campaign in franchise history didn't arrive until Battlefield 2 in 2005, but it pretty much knocked it out of the park right away. Its Hot-Swap mechanic really reinforced the immense scale of the game's conflict by putting players in the boots of a different soldier on the field after they die.