An advance on the club, a mace is a strong, heavy wooden, metal-reinforced, or metal shaft, with a head made of stone, copper, bronze, iron or steel. The head is normally about or slightly thicker than the diameter of the shaft, shaped with flanges, or knobs to allow greater penetration of armour. The length of maces can vary considerably. The maces of foot soldiers were usually quite short (two or three feet). The maces of cavalrymen were longer and better designed for blows from horseback. Two-handed maces ("mauls") could be even larger. The flail is often incorrectly called a mace.
The discovery of copper and bronze made the first genuine metal maces possible.
The mace passed out of general use in the iron age, when swords, spears and axes of iron became easier to make. The ancient Romans did not use maces, probably because they had no need for a heavy, armor-smashing weapon, or more likely due to the nature of the Roman infantry fighting style which involved the pilum (or spear) and the gladius (short sword used in a stabbing fashion). The use of a swinging-arc weapon in the well-disciplined tight formations of the Roman infantry would not be practical. The mace would be more useful to individual fighters, not units.
The armies of the Byzantine Empire used maces, especially from horseback.
During the Middle Ages metal armour and chainmail did much to blunt the blows of edged weapons and block arrows and other projectiles. Solid metal maces and war hammers proved able to inflict damage on well armoured knights, however, as the force of a blow from a mace would not need to puncture any armor.
One example of a mace capable of penetrating armor is the flanged mace. This variation of the mace did not become popular until significantly after knobbed maces. Although there are some references to flanged maces as early as the Byzantine empire circa 1000, it is commonly accepted that the flanged mace did not become popular in Europe until the 12th century. However, flanged mace heads were popular in the northern Muslim world even earlier, as some mace heads have been found into even ancient times. What makes a flanged mace different from other maces is the flanges, protruding edges of metal that allow it to dent or penetrate even the thickest armor.
Maces, being simple to make, cheap and straightforward in application, were quite common weapons. Peasant rebels and cheap conscript armies often had little more than maces, axes and pole arms. Few of these simple maces survive today. Most examples found in museums are of much better quality and often highly decorated. A common form of mace use by such lower classes is called the Holy Water Sprinkler. It was basically a wooden handle, with a wooden or metal head and radiating spikes. It is probably name the Holy Water Sprinkler because of its similarity to the Church object, and also the way it sprayed Holy Water (blood) around.
Medieval bishops sometimes carried maces in battle instead of swords, so as to conform to the canonical rule which forbade priests to shed blood; unlike sword-strokes or spear-thrusts, the blows from a mace could maim or kill without drawing blood. Bishop Odo of Bayeux appears on the Bayeux Tapestry wielding one at the Battle of Hastings (1066), but this practice does not appear to have been universal. For example, Archbishop Turpin wields a sword called "Almace" in The Song of Roland.
The Aztecs used a type of wooden club with sharp obsidian blades on the side (the maquahuitl), which can be regarded as a cross between club and sword.
Smaller versions, rather known as batons, are also swung as a dexterity display by so-called majorettes, often synchronized.
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