This orbat is from Ganin's book, with additions based on other information.
Ataman Annenkov was overall military commander. In order to reduce friction he divided his forces into three distinct groups, representing the Orenburg refugees, his own division and the Semirechensk Cossack groups respectively.
Northern Sector – Sergiopol (Ayagoz) to Bakhty (Chinese border), centred on Urdzhar – Major-General Bakich
1st Orenburg Cossack Division
33rd Orenburg Cossack Regiment
Ataman Regiment of 2nd Orenburg Military District
1st Orenburg Cossack Regiment
4th Orenburg Cossack Regiment
2nd Orenburg Cossack Division
Orenburg Cossack "Ataman Dutov" Regiment
14th Orenburg Cossack Regiment
15th Orenburg Cossack Regiment
16th Orenburg Cossack Regiment
2nd Orenburg Engineer Sotnia
Orenburg Horse Artillery Divizion
Separate Syzran Jäger Brigade
1st Syzran Jäger Regiment
2nd Syzran Jäger Regiment
Horse-Jäger Regiment
Kirghiz Horse Divizion of the Green Banner
Syzran Jäger Artillery Divizion
Artillery Battery
Other Units
Commander's Escort Detachment
Automobile Detachment
Radio Station
Miscellaneous Hospital units
Ataman Dutov himself was in the area of the Southern Group. It's not clear if his large escort came from the above list or was separate.
Total in force – up to 15 000 men, with 7,000 bayonets, 2,000 sabres, 200 machine guns and 5 guns.
Central Sector – Sergiopol (Ayagoz) to Kapal, centred on Uch-Aral (Usharal) – Major General Annenkov
Escort of the Ataman (presumably the Black Hussar Regiment)
Rifle Brigagde
1st Partisan Infantry Regiment
2nd Partisan Infantry Regiment
Cossack Brigade
Ataman Regiment
1st Orenburg Cossack Regiment
Cavalry Brigade
Cuirassier Regiment
Dragoon Regiment
Manchurian Cavalry Brigade
Manchurian Horse-Jäger Regiment
Kirghiz-Kalmyk Regiment
Other Units
Horse-Engineer Regiment
Reserve Regiment
Artillery Divizion
– 2 Cossack Batteries
Horse Artillery Divizion
– 2 Horse Batteries
(Semirechensk Gendarme Divizion)
There were isolated Kirghiz Regiments as well.
Southern Sector – Kapal to Lepsinsk, centred on Sarkand – Major-General Shcherbakov, Ataman of the Semirechensk Host
Semirechensk Cossack Brigade
Partisan Regiment
Priiliy Regiment
Alatau Regiment
Cossack Battery
5th Siberian Division
17th Semipalatinsk Regiment
19th Petropavlovsk Regiment
Jäger Battalion
Engineer Divizion
Other Units
Armoured Car ?
Semirechensk Rifle Regiment
Self-Defence Units
Artillery (at least 3 batteries)
Native Units
Kirghiz Regiment
Taranchi Horse Divizion