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

23. Such slaughter, however, arose from the attack of a furious enemy, fighting at that moment according to the law of war against armed men resisting. [2] More horrible was another butchery within the city, when their own citizens were slaying an unarmed, unresisting throng of women and children and throwing bodies, very often only half-dead, upon a pyre they had lighted, and streams of blood were putting out the rising flames. Finally the men, exhausted by the pitiful slaying of their own kin, threw themselves and their arms into the midst of the fire. [3] The slaughter was already finished when the victorious Romans arrived. And at the first sight of so terrible a scene they stood for a little while stunned with amazement. [4] Then, when gold and silver glistened in the heap of other objects and with the eagerness which is natural to man they were trying to snatch them from the flames, some caught fire themselves, others were scorched by the hot blast,¹ since those in front had no way of escape, while the mass of men pressed upon them from the rear. [5] Thus was Astapa destroyed by sword and fire without booty for the soldiers. Marcius, having received the [p. 97]surrender of all the other tribes of that region owing² to their fear, led his victorious army back to Scipio at (New) Carthage.

[6] About the same time came deserters from Gades promising to betray the city and the Punic garrison in that city and the commander of the garrison together with the fleet. [7] Mago after his flight had halted there, and having assembled ships on the Ocean, he had gathered up a considerable force of auxiliaries both from the African coast across the strait and from the nearest places in Spain with the help of Hanno, the prefect. [8] Promises were received from the deserters and given them, and Marcius with cohorts lightly equipped and Laelius also with seven triremes and one quinquereme were sent thither, to carry on the campaign by land and sea with a single plan.