So the core of any wall will break through

Necessarily iron it is necessary? Bronze will not go?

The gun came with the invention of gunpowder. In Russia at that time was developed the production of bells and steel to make guns the bell master. they Lily fuzei made of copper and bronze. This 15th and 16th century-it's expensive and the gun have a lot of material. Since the 17th century moved to the cast iron. In Sweden they made cannons out of leather due to lack of metals. Invented in the 18th century, on the thin copper core was wound very tight rope in several layers, all of this prokleivanie, tight tight fitting leather and strengthened with metal hoops. Gun stood a few shots, This gun weighed only about 70 kg was short-lived and gave rise to field artillery

Well, now we know almost all about the development of artillery. Wood did wooden staves held together with metal hoops. Probably the first gun did the Coopers.

They invented it, and then accidentally blew up a barrel of fermented drink

thanks for the informative comments - have fun, learn and grow.

About wooden did not know, and in Europe, the first gun did the Coopers, only took metal strips and fastened their hoops. Scattered after a few shots. All about guns will never know. Gunpowder appeared in every country, and tried to use it