The latest video from chart-topping band fun. (yes, lower-case “f” and punctuation intended) took things in a bit of a different direction from what fans of their single “We Are Young” might have expected. The second single and title track off their album Some Nights is not set to an epic party scene. Instead the band performs in the middle of the Civil War. The video, complete with flashbacks and fire, takes place mostly on the battlefield—complete with fully decked-out Civil War reenactors on both sides.
So how did it all come together? And what did the devoted reenactors think about appearing in a music video? TIME has an exclusive first look at the making of the music video. Check it out above, and read more about fun. on TIME.com today.