Titus Livius (Livy), The History of Rome, Book 5
Rev. Canon Roberts, Ed.

48. But¹ the greatest of all the evils arising from the siege and the war was the famine which began to afflict both armies, whilst the Gauls were also visited with pestilence. [2] They had their camp on low-lying ground between the hills, which had been scorched by the fires and was full of malaria, and the least breath of wind raised not dust only but ashes. [3] Accustomed as a nation to wet and cold, they could not stand this at all, and tortured as they were by heat and suffocation, disease became rife among them, and they died off like sheep. They soon grew weary of burying their dead singly, so they piled the bodies into heaps and burned them indiscriminately, and made the locality notorious; it was afterwards known as the Busta Gallica. [4] Subsequently a truce was made with the Romans, and with the sanction of the commanders, the soldiers held conversations with each other. The Gauls were continually bringing up the famine and calling upon them to yield to necessity and surrender. To remove this impression it is said that bread was thrown in many places from the Capitol into the enemies' pickets. [5] But soon the famine could neither be concealed nor endured any longer. So, at the very time that the Dictator was raising his own levy at Ardea, and ordering his Master of the Horse, L. Valerius, to withdraw his army from Veii, and making preparations for a sufficient force with which to attack [6??] the enemy on equal terms, the army of the Capitol, worn out with incessant duty, but still superior to all human ills, had nature not made famine alone insuperable by them, were day by day eagerly watching for signs of any help from the Dictator. [7] At last not only food but hope failed them. Whenever the sentinels went on duty, their feeble frames almost crushed by the weight of their armour, the army insisted that they should either surrender or purchase their ransom on the best terms they could, for the Gauls were throwing out unmistakable hints that they could be induced to abandon the siege for a moderate consideration. [8] A meeting of the senate was now held, and the consular tribunes were empowered to make terms. A conference took place between Q. Sulpicius, the consular tribune, and Brennus, the Gaulish chieftain, and an agreement was arrived at by which 1000 lbs. of gold was fixed as the ransom of a people destined ere long to rule the world. [9] This humiliation was great enough as it was, but it was aggravated by the despicable meanness of the Gauls, who produced unjust weights, and when the tribune protested, the insolent Gaul threw his sword into the scale, with an exclamation intolerable to Roman ears, ‘Woe to the vanquished!’