Type of polearm with axe blade topped with a spike
A halberd (also called halbard, halbert or Swiss voulge) is a two-handed polearm that came to prominent use from the 13th to 16th centuries. The halberd consists of an axe blade topped with a spike mounted on a long shaft. It can have a hook or thorn on the back side of the axe blade for grappling mounted combatants and protecting allied soldiers, typically musketeers. The halberd was usually long.
The word "halberd" is cognate with the German word "Hellebarde", deriving from Middle High German "halm" (handle) and "barte" (battleaxe) joined to form "helmbarte". Troops that used the weapon were called halberdiers. The word has also been used to describe a weapon of the early Bronze Age in Western Europe. This consisted of a blade mounted on a pole at a right angle.
History.
The halberd is first mentioned (as ) in a work by 13th-century German poet Konrad von Würzburg. John of Winterthur described it as a new weapon used by the Swiss at the Battle of Morgarten of 1315. The halberd was inexpensive to produce and very versatile in battle. As the halberd was eventually refined, its point was more fully developed to allow it to better deal with spears and pikes (and make it able to push back approaching horsemen), as was the hook opposite the axe head, which could be used to pull horsemen to the ground. A Swiss peasant used a halberd to kill Charles the Bold, the Duke of Burgundy, at the Battle of Nancy, decisively ending the Burgundian Wars. 
The halberd was the primary weapon of the early Swiss armies in the 14th and early 15th centuries. Later, the Swiss added the pike to better repel knightly attacks and roll over enemy infantry formations, with the halberd, hand-and-a-half sword, or the dagger known as the "Schweizerdolch" used for closer combat. The German "Landsknechte", who imitated Swiss warfare methods, also used the pike, supplemented by the halberd—but their side arm of choice was a short sword called the "Katzbalger".
As long as pikemen fought other pikemen, the halberd remained a useful supplemental weapon for "push of pike", but when their position became more defensive, to protect the slow-loading arquebusiers and matchlock musketeers from sudden attacks by cavalry, the percentage of halberdiers in the pike units steadily decreased. By 1588, official Dutch infantry composition was down to 39% arquebuses, 34% pikes, 13% muskets, 9% halberds, and 2% one-handed swords. By 1600, troops armed exclusively with swords were no longer used and the halberd was only used by sergeants.
Researchers suspected that a halberd or a bill sliced through the back of King Richard III's skull at the Battle of Bosworth Field on 22 August 1485, leaving his brain visible before killing him during the battle, and were later able to confirm that it was a halberd.
While rarer than it had been from the late 15th to mid-16th centuries, the halberd was still used infrequently as an infantry weapon well into the mid-17th century. The armies of the Catholic League in 1625, for example, had halberdiers comprising 7% of infantry units, with musketeers comprising 58% and armored pikemen 35%. By 1627 this had changed to 65% muskets, 20% pikes, and 15% halberds. A near-contemporary depiction of the 1665 Battle of Montes Claros at Palace of the Marquises of Fronteira depicts a minority of the Portuguese and Spanish soldiers as armed with halberds. Antonio de Pereda's 1635 painting "El Socorro a Génova" depicting the Relief of Genoa has all the soldiers armed with halberds. The most consistent users of the halberd in the Thirty Years' War were German sergeants who would carry one as a sign of rank. While they could use them in melee combat, more often they were used for dressing the ranks by grasping the shaft in both hands and pushing it against several men simultaneously. They could also be used to push pikes or muskets up or down, especially to stop overexcited musketeers from firing prematurely.
The halberd has been used as a court bodyguard weapon for centuries, and is still the ceremonial weapon of the Swiss Guard in the Vatican and the "Alabarderos" (Halberdiers) Company of the Spanish Royal Guard. The halberd was one of the polearms sometimes carried by lower-ranking officers in European infantry units in the 16th through 18th centuries. In the British army, sergeants continued to carry halberds until 1793, when they were replaced by spontoons. The 18th-century halberd had, however, become simply a symbol of rank with no sharpened edge and insufficient strength to use as a weapon. It served as an instrument for ensuring that infantrymen in ranks stood correctly aligned with each other and that their muskets were aimed at the correct level.
The development of the halberd.
The word helmbarte or variations thereof show up in German texts from the 13th century onwards. At that point, the halberd is not too distinct from other types of broad axes or bardiches used all over Europe. In the late 13th century the weapon starts to develop into a distinct weapon, with the top of the blade developing into a more acute thrusting point. This form of the halberd is erroneously sometimes called a voulge or a swiss voulge, but there is no evidence for the usage of these terms for this weapon historically. There were variations of these weapons with spikes on the back, though also plenty without. In the early 15th century the construction changes to incorporate sockets into the blade, instead of hoops as the previous designs had. With this development back spikes are directly integrated into the blade construction and become a universal part of the halberd design.
References.
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