Titus Livius (Livy), The History of Rome, Book 7
Rev. Canon Roberts, Ed.

6. After¹ this appalling portent had been duly expiated, the deliberations of the senate were concerned with the Hernici. [2] The mission of the Fetials who had been sent to demand satisfaction proved to be fruitless; the senate accordingiy decided to submit to the people at the earliest possible day the question of declaring war against the Hernici. [3] The people in a crowded Assembly voted for war. Its conduct fell by lot to L. Genucius. [4] As he was the first plebeian consul to manage a war under his own auspices the State awaited the issue with keen interest, prepared to look [5??] upon the policy of admitting plebeians to the highest offices of state as wise or unwise according to the way matters turned out. [6] As chance would have it, Genucius, whilst making a vigorous attack upon the enemy, fell into an ambush, the legions were taken by surprise and routed, and the consul was surrounded and killed without the enemy being aware who their victim was.

[7] When the report of the occurrence reached Rome, the patricians were not so much distressed at the disaster which had befallen the commonwealth as they were exultant over the unfortunate generalship of the consul. Everywhere they were taunting the plebeians: ‘Go on! [8] Elect your consuls from the plebs, transfer the auspices to those for whom it is an impiety to possess them! [9] The voice of the plebs may expel the patricians from their rightful honours, but has your law, which pollutes the auspices, any force against the immortal gods? [10] They have themselves vindicated their will as expressed through the auspices, for no sooner have these been profaned by one who took them against divine and human law than the army and its general have been wiped out as a lesson to you not to conduct the elections to the confusion of all the rights of the patrician houses.’ [11] The Senate-house and the Forum alike were resounding with these protests.

Appius Claudius, who had led the opposition to the law, spoke with more weight than ever while he denounced the result of a [12??] policy which he had severely censured, and the consul Servilius, with the unanimous approval of the patricians, nominated him Dictator. Orders were issued for an immediate enrolment and the suspension of all business.