The Army Group Rupprecht of Bavaria or Army Group A (German: "Heeresgruppe Kronprinz Rupprecht von Bayern") was an Army Group of the German Army, which operated on the Western Front under command of Rupprecht, Crown Prince of Bavaria , between 28 August 1916 and 11 November 1918 during World War I.
 It was formed from the short-lived Army Group Gallwitz under Max von Gallwitz (19 July - 28 August 1916).
Army Group South (German: "Heeresgruppe Süd" ) was the name of two German Army Groups during World War II.
 It was first used in the 1939 September Campaign, along with Army Group North to invade Poland.
 In the invasion of Poland Army Group South was led by Gerd von Rundstedt and his chief of staff Erich von Manstein.
 Two years later, Army Group South became one of three army groups into which Germany organised their forces for Operation Barbarossa.
 Army Group South's principal objective was to capture Soviet Ukraine and its capital Kiev.
Ober Ost is short for "Oberbefehlshaber der gesamten Deutschen Streitkräfte im Osten ", which is German for "Supreme Commander of All German Forces in the East" during World War I.
 It also has an implied double meaning, as in its own right, "Ober Ost" translates into "Upper East," which describes its geographic region in reference to the German Empire.
 In practice it refers not only to said commander, but also to his governing military staff and the district they controlled: "Ober Ost " was in command of the German section of the Eastern front.
Gertrud Wilhelmine von Hindenburg (born December 4, 1860 in Magdeburg, † May 14, 1921 in Hannover) was a German noblewoman and philanthropist.
 She was the wife of Paul von Hindenburg, the Chief of the German Army Command in the second half of the First World War and President of Germany.
Army Group Courland (German: "Heeresgruppe Kurland" ) was a German Army Group on the Eastern Front which was created from remnants of the Army Group North, isolated in the Courland Peninsula by the advancing Soviet Army forces during the 1944 Baltic Offensive of the Second World War.
 The army group remained isolated until the end of World War II in Europe.
 All units of the Army Group were ordered to surrender by the capitulated Wehrmacht command on 8 May 1945.
Fedor von Bock (3 December 1880 – 4 May 1945) was a German field marshal who served in the German army during the Second World War.
 Bock served as the commander of Army Group North during the Invasion of Poland in 1939, commander of Army Group B during the Invasion of France in 1940, and later as the commander of Army Group Center during the attack on the Soviet Union in 1941; his final command was that of Army Group South in 1942.
The Army Group Hindenburg (German: "Heeresgruppe Hundenburg") was an Army Group of the German Army, which operated in the Baltics against Russia between 5 August 1915 and 30 July 1916 during World War I, under command of Ober Ost Paul von Hindenburg.
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Kurt Ferdinand Friedrich Hermann von Schleicher (   ; 7 April 1882 – 30 June 1934) was a German general and the last Chancellor of Germany during the era of the Weimar Republic.
 An important player in the German Army's efforts to avoid the restrictions of the Treaty of Versailles, Schleicher rose to power as a close advisor to President Paul von Hindenburg.
 In 1930 he was instrumental in the toppling of Hermann Müller's government and the appointment of Heinrich Brüning as Chancellor.
 From 1932 he served as Minister of War in the cabinet of Franz von Papen, whom he succeeded as Chancellor on 3 December.
 During his brief term, Schleicher negotiated with Gregor Strasser on a possible secession of the latter from the Nazi Party but their scheme failed.
 The Chancellor then proposed to President Hindenburg to disperse the Reichstag and rule as a de facto dictator, a course of action Hindenburg rejected.
 On 28 January 1933, facing a political impasse and deteriorating health, Schleicher resigned and recommended the appointment of Adolf Hitler in his stead.
 Seventeen months afterwards he was murdered on the orders of Hitler during the Night of the Long Knives.
Army Group Centre (German: "Heeresgruppe Mitte" ) was the name of two distinct German strategic army groups that fought on the Eastern Front in World War II.
 The first Army Group Centre was created on 22 June 1941, as one of three German Army formations assigned to the invasion of the Soviet Union (Operation Barbarossa).
 On 25 January 1945, after it was encircled in the Königsberg pocket, Army Group Centre was renamed Army Group North ("Heeresgruppe Nord"), and Army Group A ("Heeresgruppe A") became Army Group Centre.
 The latter formation retained its name until the end of the war in Europe.
The Army Group Gallwitz or Army Group C (German: "Heeresgruppe Gallwitz") was an Army Group of the German Army, which operated on the Western Front under command of Max von Gallwitz, between 1 February 1918 and 11 November 1918 during World War I.

Question: The Army Group Hindenburg , an Army Group of the German Army, opersated under command of Ober Ost Paul von Hindenburg, who was in command of what section of the Eastern front?
Answer: German