http://www4.uwm.edu/celtic/ekeltoi/v...orrio_6_2.html
I found this very interesting link to an article about the Celtiberian methods of warfare. From the article:
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From the fifth century's end to the end of the third century BC, at the end of the Middle Celtiberian phase, the dominance of the Upper Tagus and Jalon valleys shifted to the lands of the Upper Douro (Lorrio 1997: 315-316). Evidence for this change is seen in the rise of the Arevaci, the most powerful Celtiberian populus in the fight against Rome. The cemeteries of the right bank of the Upper Douro (Soria) that belonged to them contained numerous warrior tombs that reflect their importance in Arevaci society and its military character. The tombs in these cemeteries do not have the helmets, pectorals or the large embossed bronze umbos of the Aguilar de Anguita or Alpanseque type burials (Lorrio 1997: 173-182).
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During the Middle Celtiberian period (ca. 450-225/200 BC), the Celtiberians secured and stabilized the areas settled in the Early period, and began to occupy new lands such as the right bank of the Middle Ebro Valley (Capalvo 2001). The settlements grew in size (some of them between two and five hectares) and number, and the number of cemeteries increased (Fig. 18). All of this indicates sustained demographic growth and systematic occupation of territory.
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The first of the areas mentioned above corresponds to the inland regions of the Iberian Peninsula, where the Celtiberians would have been located (Fig. 3).5 This group was expressly considered by several authors to be Celtic (Posidonius, in Diodorus 5, 33; Strabo 3, 4, 5; Martial Epigr. I, 55, 8-10 and X, 63, 3-4; Isidorus Ethym. 9, 2, 114). From the late third century BC onwards, Graeco-Roman literary sources began to provide the earliest information on the Celtiberians and Celtiberia, and gave accounts of the names of Celtiberian peoples and their location. There is no single unanimous opinion regarding the links between peoples that could be considered Celtiberians, which include the Arevaci, Pelendones, Lusones, Belli and Titti, and occasionally Vaccaei, Carpetani, Olcades, Lobetani, and even more distant groups such as Oretani, Bastetani, Bastuli or Celtici. There is similarly no shortage of authors who reject the ethnic content of the term altogether, and take it to refer to all inhabitants of an extensive area of the inland Peninsula.
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The first reference to Celtiberia is made within the context of the Second Punic War, in Polybius' narration of the siege of Saguntum (3, 17, 2) in the spring of 219 BC. From this date onwards, information about Celtiberians and Celtiberia is plentiful and varied, since the Celtiberians were one of the key players in the various wars and battles that took place throughout the second and first century BC, which culminated in the destruction of Numantia in 133 BC. Celtiberia also played a vital role in the Sertonian Wars (Salinas 1996: 27-37).
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According to Strabo (3, 4, 13), Celtiberia was divided into four territories, of which he only made reference to those inhabited by the Arevaci and Lusones, although Polybius (35, 2) and Appian (Iber. 44, 48-49, 50, 61-63 and 66) revealed that the other two corresponded to the Belos and Belli and Titthi tribes. A little further on, Strabo (3, 4, 19) indicated that some believed that there were five areas. Several candidates were proposed as inhabiting this fifth zone, including the Vaccaei, who were considered Celtiberians by Appian (Iber. 50-52, 53-54) although in general they appeared in sources as two separate peoples. In all probability, this fifth section was inhabited by the Pelendones, whom Pliny (3, 26) described as Celtiberians.
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The Celtiberians could be considered an ethnic group insofar as they included subordinate ethnic units, just as the Gauls or the Iberians did, but on a smaller scale, without evidence for centralized power or even a political hierarchy (Burillo 1993: 226).
When the Celtiberian War began, the other Celtiberian tribes (Titti, Belli, Lusones, etc.) were willing to rally around them to head the war against Rome. This the Arevaci did very well, as Polybius illustrates well:
"The war between the Romans and the Celtiberians was called the 'fiery war,' so remarkable was the uninterrupted character of the engagements....The engagements as a rule were only stopped by darkness, the combatants refusing either to let their courage flag or to yield to bodily fatigue, and ever rallying, recovering confidence and beginning afresh. Winter indeed alone put a certain check on the progress of the whole war and on the continuous character of the regular battles, so that on the whole if we can conceive a war to be fiery it would be this and no other one."
Polybius, The Histories (XXXV.1)
Indeed, when Scipio Aemilianus besieged Numantia, the Arevaci capitol, He refused to give battle to the enemy, though they offered battle many times out of desparation from starvation, because he recognized that he would lose. In the end, it was not a crushing military defeat that felled the Arevaci, but starvation.
The Arevaci were the main tribe of the Celtiberians, and had lots of polical influence in the affairs of the Iberian Peninsula. During the Middle Celtiberian Period, which ended in ~220 BC, the Celtiberians were expanding into the territory of their neighbors, and consolidating these conquests. The Arevaci would certainly also take part in this expansion wave. That establishes that they were a conquest oriented people during Europa Barbarorum II's timeframe. As for their importance to other factions, the Celtiberians a s a whole were definently as powerful as the Lusotanan, perhaps even more. Furthermore, the Iberian Peninsula is begging for another faction. Having the Lusotana conquer all of the peninsula in a breeze is not very realistic, after all, they never expanded due to hostile neighbors. Having the Arevaci would help to slow down the Lusotana. Also, the Arevaci's expansionistic tendancies were counteracted by hostile neighbors, just like the Lusotana. Having both would make the portrayal of each more realistic.As the principle tribe of the Celtiberians, they certainly warrant a faction. Also, there is an ample historical record to construct the Arevaci faction.