The order of battle for Operation Chahar, in the history of the Second Sino-Japanese War (1937–1945), was:
Japan
Peiping Railway Garrison Force, Nan-kou Front - Gen. Kiyoshi Katsuki [1] [4]
5th Division – Gen. Seishiro Itagaki[4]
9th Infantry Brigade
11th Infantry Regiment
41st Infantry Regiment
21st Infantry Brigade
21st Infantry Regiment
42nd Infantry Regiment
5th Mountain Artillery Regiment
5th Cavalry Regiment
5th Engineer Regiment
5th Transport Regiment
4th Tank Battalion from Sakai Brigade -
11th Independent Mixed Brigade- Gen. Shigiyasu Suzuki
11th Independent Infantry Regiment
12th Independent Infantry Regiment
11th Independent Cavalry Company
11th Independent Field Artillery Regiment
12th Independent Mountain Gun Regiment
11th Independent Engineer Company
11th Independent Transport Company
Tank Unit – from China Stationed Tank Unit
Kwangtung Army [1] [4]
Manchukuo 5th District Army - General Shigero Fujii [7]
Jehol Detachment
Chahar Expeditionary Force - Lt. General Hideki Tojo[5], Kalgan Front
1st Independent Mixed Brigade (Sakai Brigade)- Lt. Gen Sakai Koji)
4th Tank Battalion - ? [6]
12 x Type 89 Medium Tanks
13 x Type 95 Light Tanks
12 x Type 94 Tankettes
4 x Armored Engineer Vehicles
1st Independent Infantry Regiment
1st Independent Artillery Battalion
1st Independent Engineer Company
2nd Mixed Brigade - Major Gen Masaki Honda[5](from 1st Division) Kwangtung Army)
1st Infantry Regiment - Col Sogawa[5]
3rd Infantry Regiment - Col Yuasa[5]
3rd Battalion/57th Infantry Regiment
2nd Co./1st Cavalry Regiment
4th Battalion/1st Field Artillery Regiment
1st Co./1st Engineer Regiment
Ohizumi Detachment (大泉支隊) - ? [7]
one battalion / 4th Infantry Regiment / 2nd Division
15th Mixed Brigade – Major Gen. Seiichiro Shinohara (from 2nd Division, Kwangtung Army)
16th Infantry Regiment - Col Goto [5]
30th Infantry Regiment - Col Ikagura [5]
2nd Cavalry Regiment - Lt Col Honda[5]
2nd Field Artillery Regiment - Col Takahashi[5]
2nd Engineer Regiment - Col Ito[5]
2nd Transport Regiment
Mongolian Army – Prince Teh Wang, Pao Yueh-ching [2]
1st Cavalry Division
2nd Cavalry Division
3rd Cavalry Division
4th Cavalry Division
5th Cavalry Division
6th Cavalry Division
7th Cavalry Division
8th Cavalry Division
2nd Air Group Operation Quhar - ? [3]
12th Air Regiment 2 bomber squadrons Ki-2
15th Air Regiment 4 scout plane squadrons Ki-4's and Ki.15's
2nd Battalion / 16th Air Regiment Ki-10
2 fighter squadrons, 4 scout plane squadrons, 2 bomber squadrons,
Airforce:'
Rinji Hikodan[3]
1st Hiko Daitai/16th Hiko Rentai [Kawasaki Ki-10]
1st Chutai
2nd Chutai
Light bomber daitai/16th Hiko Rentai [Type 88 reconnaissance aircraft]
2nd Hiko Daitai [Kawasaki Ki-10]
1st Chutai
2nd Chutai
8th Hiko Daitai[Kawasaki Ki-10]
1st Chutai
2nd Chutai
12th Hiko Rentai [Mitsubishi Ki-2 Type 94 observation aircraft]
Dokuritsu Hiko Dai 3 Chutai (Independent Company). Army Tipe 93 Heavy Bomber Mitsubishi Ki-1. 9 Aircraft
Independent 4th Dokuritsu Hiko Chutai [Reconnaissance squadron ]
Independent 6th Dokuritsu Hiko Chutai [Reconnaissance squadron ]
Independent 9th Dokuritsu Hiko Chutai [Kawasaki Ki-10]
Notes:
1. Kwangtung Army and Chahar Expeditionary Force were under the command of Central Supreme Command but were not under unified command on the battlefield in this campaign.
2. 11th Independent Mixed Brigade was subordinated to Kwangtung Army, At the end of July it was attached to Peiping Railway Garrison Force. In early September, it reverted to the Chahar Expeditionary Force.
3. 2nd and 15th Mixed Brigades were detachments from Divisions of the Kwangtung Army.