The primary source of the units involved in the Battle of Orel (or Orel-Kromy Operation) is Seargent Magazine #5, which was available for a while on the web.
To that I have added sub-units and numbers taken from Volkov's "Encyclopedia of the Civil War: the White Units" dating from 18 October 1919 (5 October "old style"). However, this is just a "snap shot" at a particular time, as units were being formed and destroyed at a bewildering rate.
The units listed are part of the Volunteer Army under Lieutenant-General Mai-Maevskiy.
Commander – Lieutenant-General Kutepov
Chief of Staff – Major-General Dostavalov
Commander – Major-General Timanovskiy
Chief of Staff – Colonel Bittenbinder
The strength of this division declined rapidly during the fighting around Orel and Kromy. The strengths above are quite a lot lower than the peak numbers of the start of the battle – the Kornilov Brigade had started with over 6,000 bayonets.
This division was within weeks split into the Kornilov and Markov Divisions (the artillery being split between them).
Markov Brigade – Major-General Tret'yakov
1st General Markov Officer Infantry Regiment – Colonel Bleysh – 882 bayonets, 20 MGs
2nd General Markov Officer Infantry Regiment – Colonel Morozov – 1,174 bayonets, 24 MGs
3rd General Markov Officer Infantry Regiment – Colonel Naumov – 618 bayonets, 24 MGs
The 3rd Markov Regiment was newly formed.
The Black Sea Cavalry Regiment acted as separate squadrons, supporting the Markov Brigade, at this time.
Kornilov Brigade – Colonel Skoblin
1st General Kornilov Shock Regiment – Colonel Peshnya – 945 bayonets, 26 MGs
2nd General Kornilov Shock Regiment – Captain Pashkevich – 1,150 bayonets, 30 MGs
3rd General Kornilov Shock Regiment – Cossack Captain Mileyev – 1,279 bayonets, 17 MGs
There were mounted components in the Kornilov Regiments, around 200 sabres each.
1st Artillery Brigade – Staff Captain Shperling – 14 light guns, 11 howitzers
1st Divizion – Colonel Mashin
1st General Markov Battery
2nd Light Battery
2nd Divizion – Colonel Mihailov
3rd Light Battery
4th Light Battery
3rd Divizion – Colonel Ropponet
5th Battery
6th Battery
4th Divizion – Colonel Ayvazov
7th Light Howitzer Battery
8th Light Howitzer Battery
Reserve Divizion
1st Division Assets
Reserve Battalion of the 1st Infantry Division – Colonel Konovalov – 1,122 bayonets, 7 MGs
1st General Markov Engineering Company – Colonel Grotengel'm – 563 men
Black Sea Cavalry Regiment – Colonel Glavche
Attached from the 9th Infantry Division
1st General Alekseev Partisan Infantry Regiment – Colonel Prince Gagarin – approx 1,000 bayonets
2nd General Alekseev Partisan Infantry Regiment
The 2nd General Alekseev Regiment was recently formed.
Commander– Major-General Vitkovskiy
Chief of Staff – Colonel Bredov
As with the 1st Division, unit strengths fell rapidly during the battle.
Soon afterwards this became the Drozdovskiy Division,with the Samurskiy going to the Alekseev Division.
1st Brigade – Major-General Kel'ner
1st General Drozdovsky Officer Rifle Regiment – Colonel Rummel – 1,352 bayones, 45 MGs
2nd General Drozdovsky Officer Rifle Regiment – Colonel Turkul – 1,309 bayonets, 55 MGs
The infantry regiments likely had cavalry components unrecorded or there were dispersed squadrons of a cavalry unit operating with them.
2nd Brigade – ?
3rd General Drozdovsky Officer Rifle Regiment – Colonel Dron – 1,130 bayonets, 12 MGs
83rd Samursky Infantry Regiment – Colonel Zvyagin – 1,304 bayonets, 26 MGs
The 3rd General Drozovsky Regiment was forming at this time.
The infantry regiments likely had cavalry components unrecorded or there were dispersed squadrons of a cavalry unit operating with them.
3rd Artillery Brigade – Colonel Polzikov – 20 light guns, 6 howitzers
1st Divizion – Colonel Protasevich
1st Light Battery
2nd Light Battery
2nd Divizion – Colonel Shein
3rd Light Battery
4th Light Battery
3rd Divizion – Colonel Sokolov
5th Battery
6th Battery
4th Divizion – Colonel Medvedev
7th Light Howitzer Battery
8th Light Howitzer Battery
3rd Reserve Artillery Divizion
3rd Division Assets
Reserve Battalion of the 3rd Division – Colonel Yen'kov – 850 bayonets, 4 MGs
Composite Regiment of the 1st Cavalry Brigade – 861 sabres, 10 MGs
3rd General Drozdovsky Engineer Company – Colonel Borodin – 228 men
This division was only recently formed, out of 1st Division (Alekseevs) and 3rd Division (Belozerskiy, Olonetskiy and Composite Rifle), expanded largely from POWs. The Alekseev Regiments became the Alekseev Division soon afterwards, the remainder carrying on until merged into the Drozdovsky Division in January 1920.
General Alekseev Partisan Infantry Regiment – Colonel Prince Gagarin
2nd General Alekseev Partisan Infantry Regiment (recently formed)
These two regiments were attached to the 1st Division.
Composite Rifle Regiment – Colonel Gravitskiy (in rear fighting Makhno)
13th Belozerskiy Infantry Regiment – Colonel Shteyfon (Forces of the Kiev Area)
14th Olonetskiy Infantry Regiment – (Forces of the Kiev Area)
These regiments were further west or in the rear.
3rd Separate Heavy Howitzer Divizion
Separate Heavy Tractor Gun Divizion – Colonel Sakhnovskiy
2nd Armored Train Divizion – Colonel Gromyko (attached to 1st Infantry Division)
"Officer" (light) – Colonel Lebedev
"General Kornilov" (light) – Captain Molchanov – (operating with Alekseev Regiment)
"Ivan Kalita" (heavy) – Colonel Zelenetsky
9th Armored Train Divizion (attached to 3rd Infantry Division)
"Drozdovets" (light) – Captain Ripke
"The Thunder of Victory" (light) – ?
"Soldier" (heavy) – Colonel Ziegler
2nd Tank Detachment
5 tanks
1st Armoured Car Divizion
"Kornilov"
"Glorious"
"Kubanets"
"General Drozdovskiy"
others under repair
1st Corps Engineer Company – 256 men
The slower moving parts of the Corps played little or no part in the battles. The tanks, in particular, were unable to keep pace with the fast moving operations. It seems unlikely the heavy guns fared much better.
Also at the battle, but part of the 5th Cavalry Corps was:
Commander– Major-General Chekotavskiy
Chief of Staff – Colonel Kreyter
It appears that only the 1st Brigade was involved directly in the fighting around Orel. The rest was further east.
1st Brigade – Colonel Barbovich
1st General Alekseev Officer Cavalry Regiment – Colonel Saburov – 196 sabres, 16 MGs
10th Ingermanlandskiy Hussar Regiment – Captain Tikhonravov – 270 bayonets, 240 sabres
2nd Brigade
Composite Regiment of the 9th Cavalry Division – Colonel Vygran – 622 bayonets, 230 sabres, 30 MGs
Composite Regiment of the 12th Cavalry Division – Colonel Psiol – 396 bayonets, 161 sabres
3rd Brigade – Major-General Alenich
Composite Hussar Regiment – Colonel Gaevskiy
Composite Lancer Regiment – Colonel Aprelev – 310 bayonets, 95 sabres, 6 MGs
3rd Horse-Artillery Divizion – Colonel Prince Avalov
1st General Drozdovsky Separate Mountain-Horse Battery – Captain Yermolov
Composite Battery of the Caucasian Separate Mountain-Horse Artillery Divizion
7th Horse Mountain Battery (uncertain)