Editing Eberhard von Mackensen (section)

==== Activities during World War I ====
During the First World War he held positions of staff in the headquarters of his cavalry unit and, after being appointed first oberleutnant in August 1915 and then hauptmann, in the "Scholtz" Army Group which controlled the armies of the Central Powers on the Macedonian Front.

After the defeat of Germany in the Great War and the dissolution of the imperial army, von Mackensen remained in service by joining the small Reichswehr framed with the rank of Rittermeister in the 5th Reiter Regiment. Then, in 1922, he was transferred as squadron commander of the old 1. Leibhusaren Regiment. Von Mackensen's career continued later in the cadres of the general staff until in 1933 he became chief of staff of the Kavalleriekorps, the cavalry corps of the Reichswehr, while in May 1935 he took on the same post in the 10th corps. On 1st September 1934, he had already been promoted to oberst. On the eve of the Second World War, von Mackensen was generalmajor, from 1 January 1939, and commander of the 1. Kavaleriebrigade.