Operation to reclaim Wall Maria Anime Manga Wall Maria operation.png Kanji Romaji Other spellings Year Location Participants Outcome Debut manga Debut anime The operation to reclaim Wall Maria (ウォール・マリア奪還作戦 Wōru Maria Dakkan Sakusen?, also referred to as the operation to retake Wall Maria in the FUNimation sub of the anime) was a mission assigned by the Royal Government in which twenty percent of the human population that remained after the fall of Wall Maria were sent out to reclaim land. In truth, the operation was begun in order to alleviate the food shortage brought on by the significant loss of territory and influx of refugees from Wall Maria, and a tremendous number of people died during the operation at the hands of the Titans.