Orders were given to the 13th SS Division to provide a cadre for the new division, and "SS Standartenführer" (Colonel) Helmuth Raithel, a regimental commander from the 13th SS Division, was appointed as the new division's commanding officer. The formation of the division was delayed by Operation Vollmond to which the 13th SS Division was heavily committed, so formation did not begin until 19 June. On 21 June, Himmler promoted Sauberzweig to "SS Gruppenführer and Generalleutnant of Waffen-SS" (major general) and appointed him to command the Bosnian corps, which was given the title IX "Waffen" Mountain Corps of the SS (Croatian). The corps was to form at Bácsalmás in southern Hungary, where the 18th SS Volunteer Panzergrenadier Division "Horst Wessel" was deployed.