About this subject I pointed above to some archeologycal and classical sources that point to celtiberian migrations or invasions, specially across Carpetania and Bastetania, there are some references about his presence in Castulo area (famous mining settlement).
Most of the iberian prerroman tribes, clans or gens were involved in constat wars with each other, what explain the aboundance of hillforts, Oppida and other fortified settlements among the Peninsula since the Bronze Age.
But going more in depth, we could speak about the Arevaci expansionism. Some scholars think that the came of Rome cut off the in crescendo expansionism of this celtiberian tribe. For instance they conquered Numantia itself from the Pelendoni. This classical celts cainism ended in some way when the romans came and most of the tribes wanted to fear the common enemy united. But of course the romans tried explode his natural agressivity to divided them again, for example a celtiberian clan allied with romans to fight against the Lusitani, but later Titus Didius invite this "traitors" to his campement promising the looting and then closed the gates and kill all of them, as Appian said "for this Didius was actually hounred with a triuph". A good example of divide and conqueror tactic which later employed Julius Caesar to subjugate Gaul (Some authors suggest that the siege of Numantia by Scipio Emilianus -gradson of Scipio Africanus- may well have inspired the tactics of Caesar in Alesia siege).
By the way, speaking more about the repercusions in roman world of the celtiberian wars, for instance until these wars they elected the Consuli with the year entrance (in march), but as they needed fast new consuls to lead the troops in the campaign they change the election of them to January month, thing what some authors even think can be in relation to the later change of the year coming to the current one. The celtiberian wars were a kind of Vietnam war for Republican Rome during most of the II century BC, with a vicious spiral of attrocities, indecisive campaigns, militar incompetence (Pallantia 136 BC, Mancinus, Nobilior) and cruelity (Titus Didius, Scipio, Lutia hillfort) who provoqued controversy among roman senators. But this Vietnam was finally subjugated, (althought there were more sublevations after that, and later for example when the cimbri and teutones migration asolated the whole Empire, were the celtiberians the first who defeated them when they invaded their own lands -already under roman rule-).
As Polybius said: "This war between the Romans and Celtiberians is called the fiery War, for while wars in Greece or Asia are settled with one or two pitched battles, the battles there dragged on, only brought to a temporary end by the darkness of the night. Both sides refused to let their courage flag or their bodies tire" (my signature :D)
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