During the Second Punic Wars they were allies of Carthage and some of them crossed the Alps under the Hannibal's command.
The Romans spent years to pacify those tribes but, at the end, the Iberia becames a Roman province. Celtiberians served as auxiliary unit during the Roman Empire period.
I prepared some bases of these tribes as Dbmm Aux
Scutarii, generally were equipped with a sword, a great oval shield (scutum) and heavy javelins The design of the roman legionaries' sword (the gladius) was largely influenced by the blades carried by these troops.
Caetrati were equipped in a similar way but they use a smaller shield called caetra