The Indochina Expedition order of battle in World War II Southeast Asia, Vichy Indochina versus Japan, 1940 and the Sino-Japanese Air War, from 1937–1945:
5th Division - Lt. Gen. Akihito Nakamura [1]
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
Indochina Expeditionary Army - Maj. Gen. Takuma Nishimura [1]
Indochina Expeditionary Infantry Group - Maj. Gen. Takeshi Sakurada
2nd Imperial Guards Infantry Regiment - Col. Kunio Osonoe
Indochina Expeditionary Tank Unit (14th Tank Regiment)
Indochina Expeditionary AA Gun Unit
Signal Unit and others
IJAAF[4]
1st Hikodan Headquarters
59th Sentai
90th Sentai
ground service units
3rd Hikoshidan Headquarters
18th I F Chutai
60th Sentai
ground service units
Imperial Japanese Navy
2nd Fleet
Destroyer Squadron 3
CL Sendai
Destroyer Divisions 12 and 20 with DD Nenohi
IJN airforce: [4]
Carrier Hiryū
Fighter daitai - Mitsubishi A5M
Bomber daitai - Aichi D1A2
Attack daitai - Yokosuka B4Y1
Seaplane tender Kamikawa Maru
4 Type 94 Kawanishi E7K2 “Alf” reconnaissance float biplanes
8 Type 95 Nakajima E8N2 “Dave” reconnaissance float biplanes
Japanese warships and transports carrying Expeditionary Force lying off Haiphong in the Gulf of Tonkin.
Hanoi - Général de Corps d'Armée Maurice Martin
Haiphong
shore defenses
Lang Son sector
2nd Brigade - Général de brigade Germain Mennerat
five battalions of infantry:
I/3rd Régiment de Tirailleurs Tonkinois (RTT)
II/5th Régiment Ėtranger d'Infanterie (REI)
I/9th Régiment d'Infanterie Coloniale (RIC)
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a group of tanks,
a group of 75 mm artillery
a battery of 155 mm artillery
That Khe - 1 company of II/3rd Régiment de Tirailleurs Tonkinois (RTT)
Nam Quam - 2 companies of II/3rd Régiment d'Infanterie Coloniale (RIC)
Chima - 1 Platoon of a company of II/3rd Régiment de Tirailleurs Tonkinois (RTT)
Loc Binh - bulk of a company of II/3rd Régiment de Tirailleurs Tonkinois (RTT)
Na Dzuong - elements of 9th Régiment d'Infanterie Coloniale (RIC)
All told, about 5000 troops representing elements of 3rd Régiment de Tirailleurs Tonkinois, 9th Régiment d'Infanterie Coloniale, and 5th Régiment Étranger d'Infanterie.
Reserves:
IV/3rd Régiment de Tirailleurs Tonkinois (RTT) - to counterattack toward Dong Dang
"fresh battalions" - Lang Giai and Lang Nac barring the route from Lang Son to Hanoi
