A battery tower was a defensive tower built into the outermost defences of many

castle A castle is a type of fortification, fortified structure built during the Middle Ages predominantly by the nobility or royalty and by Military order (monastic society), military orders. Scholars usually consider a ''castle'' to be the private ...

s, usually in the 16th century or later, after the advent of

firearm A firearm is any type of gun that uses an explosive charge and is designed to be readily carried and operated by an individual. The term is legally defined further in different countries (see legal definitions). The first firearms originate ...

s. Its name is derived from the word battery, a group of several

cannon A cannon is a large-caliber gun classified as a type of artillery, which usually launches a projectile using explosive chemical propellant. Gunpowder ("black powder") was the primary propellant before the invention of smokeless powder during th ...

. These, usually round, towers could house numerous cannon oriented in various directions and on several levels and their firepower was therefore clearly superior to that of any attackers who, at best, could only bring their cannon to bear on the main line of assault. The individual levels of battery towers are often connected by ramps so that the cannon could be arranged in various ways at the many embrasures. Where artillery towers were level with their adjacent walls they were called roundels. There are battery towers at: * Bentheim Castle * Nanstein Castle * Neudahn Castle * Burg Castle * Calenberg Castle * Zwinger

See also