The arquebus (sometimes spelled harquebus, harkbus

History
In terms of acuracy, the arquebus was extremely inferior to archery. However, the arquebus had a faster rate of fire than the most powerful of crossbows, had a shorter learning curve than a longbow, and was more powerful than either. An arquebusier could carry more ammunition and powder than a crossbowman or longbowman could with bolts or arrows. The weapon also had the added advantage of scaring enemies (and spooking horses) with the noise. Perhaps most importantly, producing an effective arquebusier required a lot less training than producing an effective bowman.
On the down side, practice ammunition could not be reused like bolts and arrows and the arquebus was more sensitive to humid weather. Gunpowder also ages much faster than a bolt or an arrow—particularly if improperly stored. Also, the resources needed to make gunpowder were less universally available than the resources needed to make bolts and arrows. It was also significantly more dangerous to its user. The arquebusier carries a lot of gunpowder on his person and has a lit match in one hand. The same goes for the soldiers next to him. Amid the confusion, stress, and fumbling of a battle and arquebusiers are potentially a danger to themselves. Furthermore, the amount of smoke produced by blackpowder weapons was considerable, making it hard to see the enemy after a few salvoes. Prior to the wheel lock the need for a lit match made stealth and concealment nigh impossible, particularly at night. Bows and crossbows can shoot over obstacles by firing with high-arcing ballistic trajectories in order to reach the enemy when he has some frontal but no overhead cover (such as when your own troops are in melee with the enemy)—albeit with much less accuracy—an arquebus cannot do this.