Was the katana the primary weapon of samurai?

No — not on the battlefield. The katana was primarily a sidearm: carried at all times, used in close quarters, and central to duelling culture. But in actual battlefield conditions, samurai in the Heian and Kamakura periods fought primarily as mounted archers. In the Sengoku period, the spear (yari) dominated infantry formations. The sword became the symbolic and cultural centre of samurai identity, especially in the peaceful Edo period — but that symbolic role came after the battlefield role had diminished.

What was the bow's role for samurai?

The yumi (Japanese longbow) was the prestige weapon of the Heian and Kamakura mounted warrior. Battles were opened with arrow exchanges; individual warriors announced themselves and engaged in archery duels before closing for hand-to-hand combat. The mounted archer was the defining image of elite Japanese warfare in these periods. The asymmetric design of the yumi (longer above the grip than below) made it practical to use from horseback.

Did samurai use firearms?

Yes, from 1543 onward. Portuguese traders introduced the arquebus (tanegashima) to Japan in 1543. Oda Nobunaga systematised firearm use at the Battle of Nagashino (1575), deploying massed arquebusiers to devastating effect. By the late Sengoku period, firearms were a significant part of Japanese armies. After the wars ended, Japan's ruling class deliberately restricted firearms production and use — leading to a famous historical reversal.

What Weapons Did Samurai Use?

The image of the samurai is inseparable from the sword — specifically the katana. That image is historically misleading. For most of Japanese history, the katana was a sidearm. Samurai fought primarily with other weapons depending on the period and context.

By Period

Heian and Kamakura (794-1333): The Mounted Archer

The defining warrior of the Heian and Kamakura periods was the mounted archer — an elite horseman trained primarily in the bow (yumi). Opening exchanges of battles were archery duels; warriors would announce their names and lineage before exchanging arrows. The yumi (Japanese longbow, asymmetrically designed for use on horseback) was the prestige weapon of the mounted aristocratic warrior. [history]

Swords were carried but used in close combat once the initial arrow exchange was done. The tachi (predecessor to the katana, worn edge-down) was the standard sword of this period.

Sengoku (1467-1615): The Spear Era

The Sengoku period transformed warfare. Mass infantry formations replaced elite cavalry as the dominant battlefield force. Ashigaru (foot soldiers) armed with long yari (straight spears) formed the core of armies. [history]

The yari’s advantages in formation fighting were decisive: it required less training than archery, could be wielded by commoner levies, and in tight ranks, coordinated thrusting was devastatingly effective. Oda Nobunaga systematised long-spear formations and used them to break cavalry charges.

Firearms entered Japan in 1543. By the late Sengoku period, arquebuses were significant battlefield weapons. Nobunaga’s deployment of massed arquebusiers at the Battle of Nagashino (1575) is one of the period’s most studied tactical innovations. [history]

Edo Period (1603-1868): The Sword’s Cultural Ascent

Paradoxically, the katana became the central symbol of samurai identity precisely when it ceased to be a primary battlefield weapon. With the Tokugawa peace, most samurai became administrators who had not fought in anyone’s lifetime. [history]

The sword became the focus of martial arts culture — kenjutsu schools proliferated, duelling culture developed, and sword ownership was legally restricted to the samurai class. The Edo period created the association between sword and samurai that dominates popular imagination today.

The Full Arsenal

A samurai’s weapons across the full period included:

Weapon	Period / Use
Yumi (bow)	Heian/Kamakura primary; prestige weapon of mounted warriors
Yari (straight spear)	Sengoku infantry primary
Naginata (curved polearm)	Heian/Kamakura; Sengoku; later women’s training weapon
Tachi (older sword, edge-down)	Heian/Kamakura mounted use
Katana (shorter sword, edge-up)	From ~14th century; dominant Edo-period blade
Wakizashi (short sword)	Worn paired with katana; indoor use
Tanto (dagger)	Backup weapon; seppuku instrument
Tanegashima (arquebus)	From 1543; Sengoku firearms

The concept of bugei juhappan (武芸十八般, the eighteen martial arts) encapsulates the samurai ideal: mastery of multiple weapons and martial skills throughout a warrior’s career.