Ancient Celtic warfare refers to the historical methods of warfare employed by various Celtic people and tribes from Classical antiquity through the Migration period.
Unlike modern military systems, Celtic groups did not have a standardized regular military. Instead, their organization varied depending on clan groupings and social class within each tribe.
Endemic warfare was a common and significant aspect of life in Celtic societies. However, the organizational structures of these tribes differed widely. Some had rigid hierarchies with ruling monarchies, while others operated with representational structures resembling republics.
Over time, the expansionist policies of the Roman Empire led to the incorporation of many Continental Celtic and some Insular Celtic peoples into Roman rule, such as peoples in Gaul and southern Britain. This resulted in the adoption of Roman culture by Gallic and Brittonic cultures. This led to the rise of hybrid cultures, such as the Gallo-Roman and Romano-British, during late antiquity. As a consequence, Celtic culture became predominantly confined to Insular Celtic peoples.
While archaeological discoveries offer valuable insights into the material culture of the Celts, the precise nature of their ancient combat techniques remains a topic of speculation.
Mythological
Celtic mythology is fractured, as the mythologies of most of the continental Celtic peoples, such as the Gauls, Galatians and Celtiberians, did not survive the Roman conquests, with only remnants found within Greco-Roman sources and archaeology. Most surviving Celtic mythology belongs to the Insular Celtic peoples who were able to preserve their myths and traditions with oral lore. These were committed to writing in the medieval period by Christian scribes, some time after the pre-Christian era they are supposed to depict. Irish mythology has the largest written body of myths, followed by Welsh mythology. Other surviving examples include Cornish mythology, Breton mythology and Scottish mythology.
Champion warfare was an important common aspect of Celtic mythology, with examples in the Ulster cycle, the Fourth Branch of the Mabinogi and the Arthurian cycle. In the Táin Bó Cúailnge, chiefly the story of Ulaid hero Cú Chulainn, he defeats an entire army from Connacht one by one in single combat.
This story describes combat centered on the use of the spear (gae) and javelin (gá-ín) with no mention of helmets or metal armor, which is consistent and in keeping with archaeological evidence. Chariots also played an important role in the warfare and culture of various Celtic groups, with chariot burials being an important and unifying aspect of Celtic cultures such as the Hallstatt culture, La Tène culture, Gallic and Brittonic cultures; no remains of these vehicles from the period have yet been discovered in Ireland.E. Estyn Evans, The Personality of Ireland, Cambridge University Press (1973),
History
Tribal warfare
Endemic warfare appears to have been a regular feature of Celtic societies. While epic literature depicts this as a sport focused on raids and hunting rather than an organized territorial conquest, the historical record reveals it to be more about different groups using warfare to exert political control, harass rivals for economic advantage and, in some instances, conquer territory.
Celtic peoples fought amongst each other and would sometimes ally themselves with the Romans, Greeks, Carthaginians, Etruscans, Macedonians, Germanic peoples and various other peoples against each other and against other Celtic groups. The organizational structure of Celtic tribes and societies varied greatly, with some groups having strict hierarchical structures and a ruling monarchy, while others exhibited representational organizational structures typical of a Republic, especially by the time of the Gallic Wars.Malleson, G.B. (1889). "Vercingetorix". Transactions of the Royal Historical Society. 4: 1–40. doi:10.2307/3678158. JSTOR 3678158.
Historical Celtic groups included the Belgae, Bituriges, Boii, Britons, Celtiberians, Gaels, Galatians, Gallaeci, Gauls, Helvetii, Lepontii, Picts, Norici and the Volcae. These groups often produced cultural offshoots through descent, diffusion, migration and Celticisation.
Archaeology provides much information regarding the material culture of the Celts, especially that of the La Tène culture and Hallstatt culture. However, the significance of these finds in determining how the ancient Celts actually fought is the subject of much speculation and debate. It was long thought, for instance, that the Celts were headhunters, but recent research from France has indicated that it may have been the heads of slain allies that were collected to be placed in porticos, while the defeated were dumped in mass graves, their weapons ritually broken.
Hallstatt cultures 1200 BC to 450 BC
The Hallstatt culture is the earliest to be identified as associated with Celtic culture, spreading from north of the Alps west into France, Southern Britain and the Iberian Peninsula. The earlier phases of the Hallstatt era fall into the Bronze Age. Swords seem to have been the primary weapon from this period, perhaps indicating that warfare was a relatively small scale affair, possibly between groups of elite warriors.
In the latter phases of the Hallstatt era, iron began to replace bronze in the manufacture of weapons, and the classic "Celtic sword" with its leaf-bladed design made its appearance. Chariot burials are also characteristic of the period. It is possible that chariots also served a function in the warfare of this age, but the chariots that have been discovered are four-wheeled vehicles and do not appear at all in Britain until the La Tène period.British Archaeology 76 "Ridding (sic) Into History"
At the very end of the Hallstatt era, the longsword seemed to fall out of favor, ousted by shorter, thrusting daggers which are found in greater numbers among grave goods in high status burials.Barry W. Cunliffe, Iron Age Communities in Britain Ch. 19 Warfare, ,
La Tène Culture 450 BC to 50 BC
The La Tène period saw changing patterns of warfare. At the beginning of the La Tène period, warfare was likely conducted on a small scale between elite warriors, perhaps in chariots, wielding a new type of Celtic longsword.
During the succeeding centuries, the design of the sword changed, tending to become shorter, single-edged and lack a thrusting point, designed purely to make a cut (although the Hallstatt-era sword had also been primarily a slashing weapon).Cowen, J. D., The Hallstatt Sword of Bronze: on the Continent and in. Britain, in: Proc. Prehist. Soc. 33 Greater regional variation in swords appeared: for example, in Britain and Ireland, longer swords were still shorter and thinner than their Continental counterparts.Piggott, S. (1950) 'Swords and scabbards of the British Early Iron Age', Proc. Prehist. Soc. 16 It is possible that, in the later La Tène era, an increasing population would have led to larger armies organized in ranks of spearmen, leading to a decline in the importance of the champion with his sword and hence a decline in sword functionality.
The La Tène era also saw the development of armor in the form of chainmail, garments constructed of linked metal rings. Finds of mail are rare, suggesting that it was a luxury restricted to high status warriors. Crested helmets of this period occur in greater numbers than mail, but overall it appears that Celtic armies of this era were made up largely of lightly armored, or unarmored, fighters.
Chariot burials continued well into the La Tène period, suggesting their continued importance in warfare. The La Tène chariot was a light, two-wheeled vehicle, unlike the heavier chariot of earlier times. The arrangement of the chariot poles in a reconstruction of the Wetwang Chariot suggests that they were drawn by small ponies, only 11 or 12 hands high, and thus seem unlikely to have been used in a frontal charge. Because chariot burials were never practiced in Ireland, the nature or existence of chariot warfare in that specific country remains unclear.
In the Later La Tène period, Roman expansion into Celtic areas began with the conquest of Gallia Cisalpina in 275 BC. The conquest of Gallia Celtica followed in 121 BC and was completed with the Gallic Wars of 58-50 BC. After this period, Gallic culture quickly assimilated to Roman culture, giving rise to the hybrid Gallo-Roman culture of Late Antiquity.
Continuation in Ireland
Roman conquest eventually extinguished the cultural and political independence of all the Celtic peoples, starting on the Italian peninsula, then moving to the Iberian Peninsula, Anatolia, Gaul and finally southern Britain. Celtic cultural independence survived only in Ireland, Scotland, Wales and Cumbria.
After the Roman era, a distinctly Celtic culture, peoples and style of warfare remained only in the British Isles. Ireland was the last region to adopt the La Tène style of Celtic culture and technology, with a smaller and less dense population than the British or Continental Celts. The Gaelic Irish thus sustained an era of small scale elite clan warfare for much longer.Ó Cléirigh, Cormac (1997). Irish frontier warfare: a fifteenth-century case study (PDF). Archived from the original (PDF) on 30 December 2010.
Traditional patterns of warfare seem to have continued all the way until the Viking and Norman invasions. For centuries, the backbone of any Gaelic Irish army was lightly armed foot soldiers called Ceithearn or Kern. Kern usually fought without metal armor including helmets, although they were protected by a round shield (sciath), and wielded spears (gae) and a set of javelins or darts (gá-ín), a long dagger (scian), occasionally axes (tua) and bows (bogha), and, in the case of higher status and class warriors, swords (claideamh).The Archaeology of Late Celtic Britain and Ireland c.400-1200AD, Lloyd Laing, 1975 The Viking invasions saw some adoption of the shortbow and heavier armor, albeit never in great numbers.
The Norman invasion in the 12th century, and the ineffectiveness of traditional tactics in resisting it, led to the Irish moving towards a more typically medieval style of warfare, exemplified by the Gallóglaigh or Gallowglass heavy infantry soldier. Unlike Kern, Gallowglass usually wore chainmail and iron helmets and wielded heavy weaponry such as the Dane axe, sparth axe, claymores and sometimes spears or lances. They were a kind of heavy infantry, shock troop and elite bodyguard for the Gaelic nobility. They were the Celtic response to the heavily favored and armored heavy cavalry, knights and men-at-arms of this era and were very effective.
Gallic Wars
The best known Roman source for descriptions of Celtic warfare is Julius Caesar's Commentaries on the Gallic Wars, in which he describes the methods of warfare of both the Gauls and the Britons.
The Gallic Wars were a series of military campaigns waged by the Roman proconsul against Gallic tribes, lasting from 58 BC to 51 BC. The Romans would also raid and invade Britannia and Germania. The Gallic Wars culminated in the decisive Battle of Alesia in 52 BC, in which a complete Roman victory resulted in the expansion of the Roman Republic over the whole of Gaul. These wars paved the way for Caesar (and later his anointed successor, Octavian) to gain unchecked control of the Roman Republic.