sentences:  Single combats were characteristic of the Samurai fighting tradition and known as "Ikki-uchi".As each samurai commanded his unit of retainers, successfully challenging and defeating the opposing samurai by a single combat can force the entire unit to retreat minimizing casualties and changing the course of battle.Those seeking a suitable opponent, frequently used Nanori to issue a challenge by announcing his name and bravery as well as ridiculing opponents to boost morale of his side as well as enrage the opponent to force the combat.