From the press release:
The Civil Wars was recorded in Nashville between August 2012 and January 2013. Charlie Peacock was once again at the helm as producer for the album. Additionally, Rick Rubin produced the duo’s performance for the track “I Had Me a Girl” in August of 2011. Peacock later completed the track by producing the instrumentation and mix.
The album was recorded amidst a grueling touring schedule, exhausting workload and a growing disconnect from their families. Personal statements from band-members Joy Williams and John Paul White can be viewed at thecivilwars.com.