Heeresgruppe F
Following intelligence collection, higher level planning for the operation began on 6 May 1944, after von Weichs had issued his initial orders. Hitler gave his approval to von Weichs' final plans on 21 May. The order to XV Mountain Corps was issued by Lothar Rendulic, the commander of 2nd Panzer Army, on the same day, leaving only three days for preparation. Ernst von Leyser, commander of XV Mountain Corps headquartered at Knin, was responsible for the conduct of the operation. The ground forces of von Leyser's XV Mountain Corps were significantly reinforced from Army Group F, the 2nd Panzer Army and V SS Mountain Corps reserves. These reinforcements included two panzer companies, the reconnaissance battalions of the 1st Mountain Division (the 54th Mountain Reconnaissance Battalion) and the 369th (Croatian) Infantry Division, and most of the 7th SS Volunteer Mountain Division "Prinz Eugen". The total number of German troops allocated to the operation was about 16,000 men.