The first mentions of Spanish mercenaries come from the Sicilian Wars (460-307 BC), where they were part of the Carthaginian military serving in Sicily. While the Iberians may have been on the Carthaginian payroll as early as 535 BC, during the campaigns in Sardinia, their first substantial employment occurred in the Battle of Himera in 480, when Diodorus and Herodotus tell they were part of the expedition of Hamilcar I against the Greek forces of Gelo. Large contingents of Iberians reappear again in the capture of Selinunte, as well as the second battle of Himera, the battles of Akragas, Gela and Camarina, and the siege of Syracuse in 404 BC.