perpetrator: The Athenian army of Alcibiades is probably mixed in its origion: Besides Attic/Athenian the soldiers have to be also Chersonesians and Thracian as is said in 1.3.10.
The involvment of Alcibiades in this siege can be found in Xen. Hell. 1.3.20. victim: The soldiers of Clearchus are some Laconian Perioeci and a few emancipated Helots (Xen. Hell. 1.3.16).
The involvement of Cydon, Ariston, Anaxicrates, Lycurgus and Anaxilaus is known by Xen. Hell. 1.3.18. They interfere by betraying the city and open its gates to let in the Athenian army. The involvement of the other victims can be found in Xen. Hell. 1.3.15. long-term consequence: Since nothing could be achieved by the siege, the Athenians capture the city by betrayal later on and Helixus, Coeratadas and all their troops surrender themselves and become prisioners (Xen. Hell. 1.3.16-22).
Notes :
Weapon: In Xen. Hell. 1.3.14 missiles are mentioned as weapons trying to capture Byzantium.