Kayakujutsu
Encyclopedia
is the use of firearms, gunpowder
Gunpowder
Gunpowder, also known since in the late 19th century as black powder, was the first chemical explosive and the only one known until the mid 1800s. It is a mixture of sulfur, charcoal, and potassium nitrate - with the sulfur and charcoal acting as fuels, while the saltpeter works as an oxidizer...

 and explosives especially by Ninja
Ninja
A or was a covert agent or mercenary of feudal Japan specializing in unorthodox arts of war. The functions of the ninja included espionage, sabotage, infiltration, and assassination, as well as open combat in certain situations...

.
The history and mythology surrounding ninjutsu and kayakujutsu are similar to the history of chemistry and the mythology surrounding Alchemy
Alchemy
Alchemy is an influential philosophical tradition whose early practitioners’ claims to profound powers were known from antiquity. The defining objectives of alchemy are varied; these include the creation of the fabled philosopher's stone possessing powers including the capability of turning base...

. Thus kayakujutsu mysticism refers to elements like the Earth (Chi) to develop Fire (Kaji) just as alchemy referred to elements just as air, earth, fire and water.

Ninja typically used bamboo, egg shells, small bottles, and wooden boxes. Egg shells glued with either rice or wax were used either like a form of pepper spray
Pepper spray
Pepper spray, also known as OC spray , OC gas, and capsicum spray, is a lachrymatory agent that is used in riot control, crowd control and personal self-defense, including defense against dogs and bears...

 or create thick clouds of smoke, to confuse attackers (metsubushi
Metsubushi
- "eye closers", the name for variety of implements and techniques used by samurai police and other individuals to temporarily or permanently blind or disorient an opponent in feudal Japan.-Description:...

).

Bamboo was more used for ambushes along roadways usually like claymore mines.

Small bottles were used more in the city, mainly as a noise maker, often
to startle horses, or distract people.

Wooden boxes were used more to attack castles or fortifications
to create openings in the castle defenses.
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