The original poster is no doubt referring to Publius Decius Mus, father and son, who devoted their lives and the armies of their enemies to the gods. These incidents are favorites of mine; I'd have posted on them earlier, but haven't had the time to devote (heh) to doing it properly until this evening.
The elder Decius was consul during the Latin War in 340 BC, serving as the colleague of the great Titus Manlius Torquatus. The two consuls engaged a Latin-Campanian army near the river Veseris. Decius, in command of the left wing of the Roman army, saw that his hastati had fallen back and decided divine help was needed to ensure victory (Livy 8.9):
...Decius the consul called out to Marcus Valerius in a loud voice: “we have need of Heaven's help, Marcus Valerius. Come therefore, state pontiff of the Roman People, dictate the words, that I may devote myself to save the legions.” The pontiff bade him don the purple bordered toga, and with veiled head and one hand thrust out from the toga and touching his chin, stand upon a spear that was laid under his feet, and say as follows: “Janus, Jupiter, Father Mars, Quirinus, Bellona, Lares, divine Novensiles, divine Indigites, ye gods in whose power are both we and our enemies, and you, divine Manes, I invoke and worship you, I beseech and crave your favour, that you prosper the might and the victory of the Roman People of the Quirites, and visit the foes of the Roman People of the Quirites with fear, shuddering, and death. As I have pronounced the words, even so in behalf of the republic of the Roman People of the Quirites, and of the army, the legions, the auxiliaries of the Roman People of the Quirites, do I devote the legions and auxiliaries of the enemy, together with myself, to the divine Manes and to Earth.” Having uttered this prayer he bade the lictors go to Titus Manlius and lose no time in announcing to his colleague that he had devoted himself for the good of the army. He then girded himself with the Gabinian cincture, and vaulting, armed, upon his horse, plunged into the thick of the enemy, a conspicuous object from either army and of an aspect more august than a man's, as though sent from heaven to expiate all anger of the gods, and to turn aside destruction from his people and bring it on their adversaries. Thus every terror and dread attended him, and throwing the Latin front into disarray, spread afterwards throughout their entire host. This was most clearly seen in that, wherever he rode, men cowered as though blasted by some baleful star; but when he fell beneath a rain of missiles, from that instant there was no more doubt of the consternation of the Latin cohorts, which everywhere abandoned the field in flight.
The devotio of the second Pubius Decius Mus took place at the battle of Sentinum in 295 BC. This Decius was serving his fourth consulship as the colleague of Quintus Fabius Maximus Rullianus. The Romans faced a combined army of Gauls and Samnites, with Decius in command of the Roman left, opposite the Gauls. He ordered a cavalry attack which forced the Gallic horse to retreat, but then strayed into contact enemy infantry and chariots, which threw the Roman cavalry into panic and retreat. The panic spread to his infantry and the Roman left wing began to fall back. Decius, unable to stem the rout (Livy 10.28):
...cried aloud on the name of his father Publius Decius. “why,” he asked, “do I seek any longer to postpone the doom of our house? It is the privilege of our family that we should be sacrificed to avert the nation's perils. Now will I offer up the legions of the enemy, to be slain with myself as victims to Earth and the Manes.”
On going down into the field of battle he had ordered Marcus Livius the pontifex not to leave his side. He now commanded this man to recite before him the words with which he proposed to devote himself and the enemy's legions in behalf of the army of the Roman People, the Quirites. He was then devoted with the same form of prayer and in the same habit his father, Publius Decius, had commanded to be used, when he was devoted at the Veseris, in the Latin war; and having added to the usual prayers that he was driving before him fear and panic, blood and carnage, and the wrath of gods celestial and gods infernal, and should blight with a curse the standards, weapons and armour of the enemy, and that one and the same place should witness his own destruction and that of the Gauls and Samnites, having uttered, I say, these imprecations upon himself and the enemy, he spurred his charger against the Gallic lines, where he saw that they were thickest, and hurling himself against the weapons of the enemy met his death.
The son of the second Decius commanded at Ausculum in 279 BC with his colleague Publius Sulpicius Saverrio. The fate of the third Publius Decius Mus isn't mentioned by Dionysios of Halikarnasos or Plutarch, and the book of Livy which dealt with Ausculum has not survived. However, the periochae (or epitome) of Livy explicitly mentions the devotio at Veseris and at Sentinum, but does not tell of a devotio at Ausculum. Tales of this sort were favorites of Livy, combining piety and patriotic self-sacrifice, so if the Decius of Ausculum had devoted himself, the periochae would certainly have mentioned it, as it did for his father and grandfather.
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