The Army Group Mackensen (German: Heeresgruppe Mackensen, HGr. Mackensen) which operated in Poland between 22 April 1915 and 8 September 1915 during World War I under the command of Field Marshal August von Mackensen, was an army group of the Imperial German Army.
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It was renamed on 8 September 1915 to Army Group Linsingen when Alexander von Linsingen became its new commander. In June 1916, the Army Group faced the Brusilov Offensive. After an initial retreat, it checked the Russian advance at the Battle of Kowel. After the signing of the Treaty of Brest-Litovsk in March 1918, the Army Group occupied the Ukraine.
On 31 March 1918, von Linsingen was replaced by Hermann von Eichhorn and the Army Group was renamed Army Group Eichhorn-Kiev (German: Heeresgruppe Eichhorn-Kiew). It was again renamed on 3 April to Army Group Eichhorn and a last time on 13 August to Army Group Kiev after the murder of General Eichhorn. His successor was Günther von Kirchbach. The Army Group was disbanded on 7 February 1919.