Referring to this time period, of great debate and interest is the so-called "Torna, Torna Fratre" episode. In Theophylactus Simocatta Histories, ( 630), the author mentions the words "τóρνα, τóρνα". The context of this mention is a Byzantine expedition during Maurice's Balkan campaigns in 587, led by general Comentiolus, in the Haemus, against the Avars. The success of the campaign was compromised by an incident: during a night march: