Trichome October 14, 2016 thcscience_admin Army Group Mackensen may refer to: Army Group Mackensen (Poland) (22 Apr 1915 – 8 Sep 1915) Army Group Mackensen (Serbia) (18 Sep 1915 – 30 July 1916) Army Group Mackensen (Romania) (28 Aug 1916 – 7 May 1918) Topics referred to by the same term