 In 211 BC, the Roman senate sent "Gaius Nero" to Hispania with 6,000 Roman and 6,000 allied infantry and 300 Roman and 600 allied cavalry.He landed at Tarraco, marched to the Ebro and took over the force of Tiberius Fonteius and Lucius Marcius.He then advanced against the enemy and occupied the two exits of the pass to Lapides Atri (Black Boulders), in Ausetanian territory, where Hasdrubal (Hamilcar's son) was encamped, thus shutting him in.