Titus Livius (Livy), The History of Rome, Book 28
Frank Gardener Moore, Professor Emeritus in Columbia University, Ed.

20. African deserters, who were at that time in the Roman auxiliaries, just when the townsmen had turned to the defence of places where the danger was evident, while at the same time the Romans kept coming up [2??] ... by any possible approach, caught sight of a very lofty part of the city lacking any kind of fortifications, lacking defenders as well, because it was protected by a very high cliff. [3] Men of light build and nimble, thanks to much training, they carried iron spikes with them and climbed up wherever they could over the irregular projections of the cliff. [4] Wherever they encountered rock too steep and smooth, by driving in spikes at suitable intervals they made something like steps. [5] Then while the first men with their hands drew up those who followed and the last pushed up those ahead of them, they made their way up to the summit. Thence they dashed down with a shout into the city already captured by the Romans. [6] It was then in truth evident that the city had been attacked out of anger and hatred. No one thought of taking men alive, no one thought of booty, although every place was open for plunder. They slaughtered the unarmed and the armed alike, women as well as men; cruel anger went even so far as to slay infants. [7] Then they threw firebrands into houses and demolished what could not be consumed by the flames. So delighted were they to destroy even the [p. 87]traces of the city and to blot out the memory of¹ their enemies' abode.

[8] Scipio then led his army to Castulo, a city defended not only by Spaniards from other places but also by remnants of the Carthaginian army after a scattering flight in every direction. [9] But Scipio's coming had been preceded by a report of the disaster at Iliturgi, and in consequence alarm and despair had taken possession. [10] Also as their interests were different, since everyone wished to be safeguarded himself without regard to any one else, at first unexpressed suspicion, then open discord produced a separation between Carthaginians and Spaniards. [11] The latter were commanded by Cerdubelus, an open advocate of surrender, the Punic auxiliaries by Himilco. After receiving a secret promise Cerdubelus betrayed garrison and city to the Roman commander. [12] More merciful was this victory. Not so serious a crime had been committed and voluntary surrender had greatly appeased their anger.