Attack on Titan began as Hajime Isayama's manga in 2009 and became a major anime hit from 2013, following humanity's Survey Corps fighting man eating Titans from behind walled cities. Its battle cries and charge moments became a core part of the series identity, closely linked to Commander Erwin Smith and his famous speeches before suicidal advances. Clips of those shouts spread widely through anime edits, AMVs and gaming videos online, where the soldiers charge cue came to stand for total commitment, sacrifice and refusing to retreat.