This is the order of battle for both the Russian and German armies at the Battle of Tannenberg, August 17 to September 2, 1914.
Russian Northwestern Front General Yakov Zhilinsky, Front Commander (not present)
Maj. Gen. Sir Alfred Knox, British Military Attache (attached to 2nd Army)
First Army General Paul von Rennenkampf, Commander
Lt. Gen. Gavriil Mileant, Chief of Staff
II Corps (transferred from the Second Army, 22 August) – General Sergei Scheidemann
26th Infantry Division
43rd Infantry Division
III Corps – General Nikolai Epanchin
25th Infantry Division
27th Infantry Division
IV Corps – General
30th Infantry Division
40th Infantry Division
XX Corps – General Vladimir Vasilyevich Smirnov
28th Infantry Division
29th Infantry Division
Unattached
56th Infantry Division 221st Roslav Infantry Regiment 222nd Krasnan Infantry Regiment 223rd Odoev Infantry Regiment 224th Yukhnov Infantry Regiment 73rd Artillery (Reserve) Brigade
5th Rifle Brigade
1st Guard Cavalry Division – Lt. Gen. 1st Brigade Chevalier Guard Regiment Guard Cavalry Regiment 2nd Brigade Guard Cuirassier Regiment of the Emperor Guard Cuirassier Regiment of Empress Marie
2nd Guard Cavalry Division – Lt. Gen. Georgy Ottonovich Rauch 1st Brigade Guard Horse Grenadier Regiment Guard Ulan Regiment of the Empress 2nd Brigade Guard Dragoon Regiment Guard Hussar Regiment of the Emperor
1st Cavalry Division– Lt. Gen. Vasily Gurko
2nd Cavalry Division – Lt. Gen. Huseyn Khan Nakhchivanski
3rd Cavalry Division – Lt. Gen.
1st Independent Cavalry Brigade 19th Dragoons 16th Hussars 3rd Horse Battery
1st Heavy Artillery Brigade
Second Army General Alexander Samsonov, Commander
Maj. Gen. Postowski, Chief of Staff
I Corps – General Artamanov, relieved on August 28
– Lt. Gen Alexander Alexandrovich Dushkevich
22nd Infantry Division
24th Infantry Division
VI Corps – General Alexander Blagoveshchensky
4th Infantry Division
16th Infantry Division
XIII Corps – Lt. Gen. Nikolai Klyuev
1st Infantry Division
36th Infantry Division
XV Corps – General Nikolai Martos
6th Infantry Division
8th Infantry Division
XXIII Corps – General Kyprian Kandratovich
3rd Guard Infantry Division 1st Brigade Guard Regiment Lithuania Guard Regiment Kexholm – Colonel Sirelius 2nd Brigade Guard Regiment St. Petersburg Guard Regiment Wolhyna
2nd Infantry Division
Unattached
1st Rifle Brigade
4th Cavalry Division – Lt. Gen. Anton Tolpygo
6th Cavalry Division – Lt. Gen. Vladimir Roop
15th Cavalry Division – Lt. Gen. Pavel Lyubomirov
2nd Heavy Artillery Brigade
German Eighth Army
Colonel General Maximilian von Prittwitz, Commander, replaced on August 23 Colonel General Paul von Hindenburg, Commander
Maj. Gen. Erich Ludendorff, Chief of Staff Maj. Gen. Paul Grünert, Quartermaster General Maj. Gen. Otto Kersten, Chief Engineer Lt. Col. Max Hoffmann, Chief of Operations
I Army Corps – General Hermann von François<br/ > Col. Walter Schmidt von Schmidtseck, Chief of Staff
1st Infantry Division – Lt. Gen. Richard von Conta
1st Infantry Brigade – Maj. Gen. Friedrich von Trotha 1st Grenadiers – Lt. Col. Eggerss 41st Infantry – Colonel Schönfeld
2nd Infantry Brigade – Maj. Gen. Conrado Paschen 3rd Grenadiers – Colonel von Wedel 43rd Infantry – Colonel von Eisenhart-Rothe
1st Field Artillery Brigade – Maj. Gen. Kurt Moewes 16th Field Artillery – Colonel Bromeis 52nd Field Artillery – Colonel Hellwig
8th Uhlans – Lt. Col. Freiherr Schäffer von Bernstein
2nd Infantry Division – Lt. Gen. Adalbert von Falk
3rd Infantry Brigade – Maj. Gen. Theodor Mengelbier 4th Grenadiers – Colonel Stern 44th Infantry – Colonel von Löper
4th Infantry Brigade – Maj. Gen. Bernhard Böß 33rd Fusiliers – Lt. Col. Weicke 45th Infantry – Colonel Maaß
XVII Army Corps – General August von Mackensen
35th Infantry Division – Lt. Gen. Otto Hennig
70th Infantry Brigade – Maj. Gen. Heinrich Schmidt von Knobelsdorff 21st Infantry – Colonel Brunnemann 61st Infantry – Maj. Lüdecke
87th Infantry Brigade – Maj. Gen. Johannes von Hahn 141st Infantry – Lt. Col. von Steinkeller 176th Infantry – Maj. Runge
35th Field Artillery Brigade – Maj. Gen. Leopold Uhden 71st Field Artillery – Lt. Col. Hecht 81st Field Artillery – Lt. Col. Bertog
4th Mounted Rifles – Lt. Col. Freiherr von Lön
36th Infantry Division – Lt. Gen. Konstanz von Heineccius
69th Infantry Brigade – Maj. Gen. George von Engelbrechten 129th Infantry – Colonel Breßler 175th Infantry – Lt. Col. Schleenstein
71st Infantry Brigade – Colonel Lutz von Dewitz 5th Grenadiers – Colonel Freiherr von Eichendorff 128th Infantry – Colonel von Tresckow
36th Field Artillery Brigade – Maj. Gen. Viktor Hahndorff 36th Field Artillery – Maj. Waldeyer 72nd Field Artillery – Colonel von Rabenau
5th Hussars – Colonel Freiherr von Barnekow
XX Army Corps – General Friedrich von Scholtz
37th Infantry Division – Lt. Gen. Hermann von Staabs
73rd Infantry Brigade – Maj. Gen. Carl Wilhelmi 147th Infantry – Colonel Ritzsch 151st Infantry – Colonel Dorsch 1st Jager Battalion – Maj. Weigelt
75th Infantry Brigade – Maj. Gen. Alfred von Böckmann 146th Infantry – Colonel von Heydebreck 150th Infantry – Colonel Küster
37th Field Artillery Brigade – Maj. Gen. Wilhelm Buchholz 73rd Field Artillery – Colonel Forst 82nd Field Artillery – Lt. Col. Plantier
11th Dragoons – Lt. Col. Maaß
41st Infantry Division – Maj. Gen. Leo Sontag
72nd Infantry Brigade – Maj. Gen. Georg Schaer 18th Infantry – Colonel Mecke 59th Infantry – Colonel Sonntag
74th Infantry Brigade – Maj. Gen. Rudolf Reiser 148th Infantry – Colonel von der Osten 152nd Infantry – Colonel Geisler
41st Field Artillery Brigade – Maj. Gen. Wilhelm Johann Neugebauer 35th Field Artillery – Lt. Col. Wilke 79th Field Artillery – Lt. Col. Marcus
10th Dragoons – Lt. Col. von Lewinski
I Reserve Corps – Lt. Gen. Otto von Below
1st Reserve Division – Lt. Gen. Sigismund von Förster
1st Reserve Infantry Brigade – Ma. Gen. Karl Barre 1st Reserve Infantry – Lt. Col. von Sommerfeld und Falkenhayn 3rd Reserve Infantry – Lt. Col. von Steuber
72nd Reserve Infantry Brigade – Maj. Gen. Maximilian Gustav Licht 18th Reserve Infantry – Lt. Col. Freiherr von Lützow 59th Reserve Infantry – Lt. Col. Modrow 1st Reserve Jager Battalion – Cpt. Mellin
1st Reserve Field Artillery – Lt. Col. Schulz
3rd Reserve Division – Lt. Gen. Curt von Morgen
5th Reserve Infantry Brigade – Maj. Gen. Emil Hesse 2nd Reserve Infantry – Lt. Col. Rodig 9th Reserve Infantry – Lt. Col. Wobring
6th Reserve Infantry Brigade – Maj. Gen. Erich Krause 34th Reserve Infantry – Colonel Hein 49th Reserve Infantry – Lt. Col. Freiherr von Eberstein
3rd Reserve Field Artillery Maj. Erhardt
5th Reserve Dragoons – Maj. von Götz
1st Reserve Uhlans – Maj. Berner
36th Reserve Division – Maj. Gen. Kurt Kruge
69th Reserve Infantry Brigade – Maj. Gen. Otto von Homeyer 21st Reserve Infantry – Lt. Col. Heyn 61st Reserve Infantry – Colonel Immanuel 2nd Reserve Jager Battalion – Cpt. Brückner
70th Reserve Infantry Brigade – Maj. Gen. Detlev Vett 5th Reserve Infantry – Lt. Col. Graf zu Reventlow 54th Infantry (detached from the 3rd Division at the outbreak of war) – Colonel von Tippelskirch
36th Reserve Field Artillery – Lt. Col. Lannert
1st Reserve Hussars – Maj. von Borcke
Höheres Landwehr Kommando No. 1 / 1st Landwehr Division – Lt. Gen. Georg Freiherr von der Goltz
33rd Mixed Landwehr Brigade – Maj. Gen. Viktor von Oertzen 75th Landwehr Infantry – Lt. Col. von Stwolinski 76th Landwehr Infantry – Lt. Col. Billig
34th Mixed Landwehr Brigade – Lt. Gen. Ernst von Pressentin 31st Landwehr Infantry – Lt. Col. von Lilienhoff-Zwowitzki 84th Landwehr Infantry – Colonel Becker
Landwehr Cavalry Regiment – Cpt. von Sydow
1st Cavalry Division – Lt. Gen. Hermann Brecht
1st Cavalry Brigade – Colonel Wedig von Glasenapp 3rd (East Prussian) Cuirassiers "Count Wrangel" – Lt. Col. von Lewinski 1st (Lithuanian) Dragoons "Prince Albrecht of Prussia" – Lt. Col. Graf von Kanitz
2nd Cavalry Brigade – Maj. Gen. Robert Freiherr von Kapherr 12th (Lithuanian) Uhlans – Colonel von Below 9th Jäger zu Pferde – Lt. Col. von Koppelow
41st Cavalry Brigade – Maj. Gen. Heinrich von Hofmann 5th (West Prussian) Cuirassiers "Duke Frederick Eugene of Württemberg" – Lt. Col. von Rex 4th (1st Pomeranian) Uhlans "von Schmidt" – Maj. Charisius
Other units in the field Königsbergs Reserve – Lt. Gen. Günther von Pappritz Königsberg Fortress Division – Lt. Gen. Georg Ludwig Franz Brodrück Thorn Fortress Division (35th Reserve Division) – Lt. Gen. Max Philipp von Schmettau Graudenz Fortress Division – Maj. Gen. Fritz von Unger Lötzen Fortress Brigade – Colonel Busse 6th Landwehr Brigade – Maj. Gen. Adolf Karl Krahmer 70th Landwehr Brigade – Maj. Gen. Adolf Breithaupt
Reinforcements Posen Fortress Division 1st Landwehr Division 2nd Landwehr Brigade – Colonel Arthur Freiherr von Lupin
From the Western Front XI Army Corps 22nd Division 38th Division Guards Reserve Corps 3rd Guards Infantry Division 1st Guards Reserve Division
References
Further reading Showalter, Dennis E. Tannenberg: Clash of Empires. Hamden, Connecticut: Archon Books, 1991. .