It is a forerunner of the rifle and other longarm firearms. An improved version of the arquebus, the caliver, was introduced in the early 1500s. The word is derived from the English corruption of calibre as this gun was of standard bore, increasing combat effectiveness as troops could load bullets that would fit their guns (before, they would have to modify shot to fit, force it in or cast their own before the battle).
Heavy arquebuses mounted on wagons were called arquebus à croc. These carried a ball of about 3.5 ounces.
The arquebus was the predominant firearm of the various militaries of Europe during the Thirty Years' War. After the Ring of Fire, the arquebus was rendered completely obsolete by the firearms used by the people of Grantville. The arquebus' terrible inaccuracy, relatively short effective range, and slow reloading allowed the Grantvillers to outshoot any enemy on the battlefield. The later introduction of rifled flintlock muskets and the French "Cardinal" breechloaders sealed the obsolescence of the arquebus.