 Later the Roman army was routed at the battle of Allia and Rome was sacked in 390 BC by the Senones.At the battle of Telamon in 225 BC, a large Celtic army was trapped between two Roman forces and crushed.The defeat of the combined Samnite, Celtic and Etruscan alliance by the Romans in the Third Samnite War sounded the beginning of the end of the Celtic domination in mainland Europe, but it was not until 192 BC that the Roman armies conquered the last remaining independent Celtic kingdoms in Italy.