Abattery tower was adefensive tower built into the outermost defences of manycastles and town walls, from the 15th century, after the advent offirearms.[1][2] Its name is derived from the wordbattery, a group of severalcannon.
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 manyembrasures.
Where artillery towers were level with their adjacent walls they were calledroundels.
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