In this section you will find all our Ninja swords such as Ninjato. The Ninja were covert agents or merceneries in feudal Japan. They tended to use blackened straight bladed swords. The functions of the ninja included espionage, sabotage, assassination, infiltration and Guerilla Warfare. Their covert methods of waging irregular warfare were deemed "dishonorable" and "beneath" the samurai-caste, who observed strict rules about honor and combat.The shinobi proper, a specially trained group of spies and mercenaries, appeared in the 15th century during the Sengoku period, but antecedents may have existed in the 14th century, and possibly in the 12th century.