Kammala jumla mai zuwa: Carthaginians sun kama babban birni na Taurini mai ƙiyayya (a yankin Turin na zamani) kuma rundunarsu ta kori mahayan dawakai da sojojin dakarun Romawa a yakin Ticinus a ƙarshen Nuwamba. A sakamakon haka, yawancin ƙabilun Gallic sun goyi bayan Carthaginians, kuma sojojin Hannibal sun ƙaru zuwa fiye da maza 40,000. Majalisar dattijai ta umarci wakili Sempronius Longus ya dawo da sojojinsa daga Sicily, inda yake shirin mamaye Afirka, don shiga sojojin Romawa da suka riga sun fuskanci Hannibal. Ƙungiyar Romawa ta haɗu a ƙarƙashin umurnin Sempronius ta jawo Hannibal cikin yaƙi a kan filayen da ya zaɓa a
Yaƙin Trebia. Carthaginians sun kewaye Romawa kuma kawai 10,000 daga cikin 42,000 sun iya yin yaki don samun aminci. Bayan ya tabbatar da matsayinsa a arewacin Italiya ta wannan nasarar, Hannibal ya raba sojojinsa don hunturu a tsakanin Gauls. Na biyun ya shiga rundunarsa da yawa, ya kawo ta zuwa mutane 60,000.