Siberian Army
Stackelberg was commander of the Russian 10th Cavalry Division during the suppression of the Boxer Rebellion in China and Russian occupation of Manchuria. Afterwards, he was assigned command of the 2nd Siberian Army Corps from April 25, 1901, to February 11, 1902. He was then commander of the 1st Cavalry Corps from February 11, 1902, to February 3, 1904.