Plutarch, Dion
Bernadotte Perrin, Ed.

45. Owing to this disaster more than to any thing else, the city was thrown open to Dion by unanimous consent. For he was no longer marching in haste, since he had heard that the enemy had shut themselves up in the acropolis. But as the day advanced, first, horsemen met him with tidings of the second capture of the city; next, even some of his opponents came with entreaties that he would hasten his march. [2] Moreover, as the mischief grew worse, Heracleides sent out his brother, and then Theodotes his uncle, begging Dion to help them, since no one now resisted the enemy, he himself was wounded, and the city was almost demolished and consumed by fire. When these amazing messages reached Dion, he was still sixty furlongs distant from the city gates; but after telling his mercenaries of the city's peril and exhorting them, he led his army towards the city, no longer in marching step, but on the run, while one messenger after another met him and begged him to hasten. [3] His mercenaries advancing with astonishing speed and ardour, he burst through the gates into what was called the Hecatompedon, and at once sent his light-armed troops to charge upon the enemy, in order that the Syracusans might take courage at the sight he also marshalled his men-at-arms in person, together with those of the citizens who kept running up and forming with them, dividing his commands and forming companies in column, that he might make a more formidable attack from many points at once.