With regard to his mounted force, authors are pretty much agreed, but some state that seventy thousand infantry were led to the city Silpia.

Here the two Carthaginian generals sat down on open plains, with a determination not to avoid a battle.
13.

When Scipio received an account of the collection of so large an army, he felt convinced that he would not be a match for so great a multitude with the Roman legions only, without making a show at least of the auxiliary troops of the barbarians; at the same time that he did not think it right that they should form so large a portion of his force as to occasion important consequences if they should change sides, which had brought ruin upon his father and his uncle.
Therefore, sending forward Silanus to Colca, who was sovereign of twenty-eight towns, to receive from him the infantry and cavalry, which he promised to enlist during the winter, he himself set out from Tarraco; and collecting small bodies of auxiliaries from his allies, who lay near his road as he proceeded, he came to Castulo.

To this place Silanus led the auxiliaries, consisting of three thousand infantry and five hundred horse.

Thence he advanced to the city of Baecula, with his entire army of countrymen and allies, foot and horse, amounting to forty-five thousand.