What is spigot mortar japanese?

Spigot mortar is a type of weapon used by the Japanese Army during World War II. It was a small caliber mortar that fired a bomb by inserting the tail of the bomb onto a spigot located on the barrel of the mortar. The Japanese used spigot mortars in both offensive and defensive operations, and they were particularly effective against American armored vehicles. However, they were also prone to misfires and other technical problems. Despite their limitations, the spigot mortar played a significant role in the Japanese Army's strategy during World War II.