Clearly General der Kavallerie von Mackensen (commanding XVII. Armeekorps) to the right of the Kaiser. To his right is Generalleutnant Kuno von Steuben commanding 36. Division in Danzig. Photo taken on the occasion of the installation of the Crown Prince as commanding officer of 1. Leib-Husaren-Regiment Nr. 1 at Danzig-Langfuhr on 15 September 1911.
Regards
Glenn