Ōdzutsu

An ōdzutsu (大筒, 'big cylinder') was a type of Japanese hand cannon used during the Sengoku and early Edo periods.

The ōdzutsu was used primarily in naval and siege battles during the Sengoku period for its efficiency in destroying large enemy structures.

Though interpretations of ōdzutsu differ in literature, it is generally regarded as a weapon of forged iron to distinguish it from an ishibiya (a cast bronze hand cannon).

It could be relatively easily manufactured due to its inexpensive materials, but cannot be produced with too large a diameter due to limited forging techniques at the time.

There is a famous large ōdzutsu, known as the Shibatsuji Gun, located in the Yūshūkan of Yasukuni Shrine, Tokyo.