Volley gun
The Ribauldequin was a medieval version of the volley gun. It had its barrels set up in parallel. This early version was first employed during the Hundred Years' War by the army of Edward III of England, in 1339. Later on, the late Swiss army employed it.
Volley fire
The volley tactic next appeared in early 16th century Europe when the Ottoman Janissaries clashed with European forces at the Battle of Mohács on 29 August 1526. The Janissaries equipped with 2000 "tüfenks" (usually translated as musket) "formed nine consecutive rows and they fired their weapons row by row," in a "kneeling or standing position without the need for additional support or rest." Contrary to the popular belief that the Ottomans' success at Mohács was due to their artillery, a view which many later historians have supported, contemporary European and Ottoman sources on the battle attribute their success to the Janissaries' successful deployment of firearms. However the Janissaries' prowess declined early in the 17th century as troop standards dropped and the drill was abandoned. According to the author of "The Laws of the Janissaries (Kavanin-i Yenigeriyan)", by 1606 members of the Janissaries were faced with supply issues so that they "were no longer given powder for the drills and that the soldiers used the wick for their candles and not for their muskets."