text: Prior to this engagement, one force had unsuccessfully attempted to lay siege to Placentia, then proceeded south to Fanum Fortunae.
full_question: Prior to this engagement, one force had unsuccessfully attempted to lay siege to Placentia, then proceeded south to Fanum Fortunae. When that army's commander heard the sounding of a trumpet, he correctly surmised that another general had arrived in the opposing camp, so he briefly withdrew during a night where his guards apparently deserted him. The prelude to this clash was the Battle of Grumentum, in which a nearby force camped at Canusium was repelled. The opposing army was commanded by a man whose later dispute about a tax on salt earned him the nickname Salinator; he was reinforced by the army of his co-consul Gaius Claudius Nero, who circled a ravine to execute a pincer attack. This battle, in which Marcus Livius Drusus defeated a man whose severed head was then thrown into his brother's camp, was the last major clash in Italy during the Second Punic War. For 10 points, name this 207 BC battle, where Hasdrubal was killed at the namesake river.
first_sentence: Prior to this engagement, one force had unsuccessfully attempted to lay siege to Placentia, then proceeded south to Fanum Fortunae.
raw_answer: Battle of the Metaurus River [or the Metauro River; or Metarus]