Diodorus Siculus 2.6.7-8:
Now when Semiramis arrived in Bactriana and observed the progress of the siege, she noted that it was on the plains and at positions which were easily assailed that attacks were being made, but that no one ever assaulted the acropolis because of its strong position, and that its defenders had left their posts there and were coming to the aid of those who were hard pressed on the walls below. Consequently, taking with her such soldiers as were accustomed to clambering up rocky heights, and making her way with them up through a certain difficult ravine, she seized a part of the acropolis and gave a signal to those who were besieging the wall down in the plain. Thereupon the defenders of the city, struck with terror at the seizure of the height, left the walls and abandoned all hope of saving themselves.
Source (list of abbreviations)
Diodorus Siculus 2.6.7-8
|Oldfather 1960, I 368-369||Oldfather, C. H. Diodorus of Sicily. 12 Vols. Loeb Classical Library. Cambridge MA: Harvard University Press, London: Heinemann 1960.|
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