 Complete the following phrase:  The Battle of Trebbia was fought near the lower course of the Tidone when Hannibal defeated a Roman army in 218 BC. The name dates from the battle when a Roman centurion found the Tidones waters to be clear and drinkable while the nearby Trebbia supposedly ran red with the blood of the battles victims. In thanks to the river, the officer said O Valle ti dono questo anello; ti dono I give. Also fought in the area was a second 