The XV. SS-Kosaken-Kavallerie-Korps was formed in January 1945 and consisted of 1. Kosaken-Kavallerie-Division and 2. Kosaken-Kavallerie-Division apart from the Korpstruppen.

At the end of the war the cossack units surrendered to the British forces in Austria after receiving a guarantee from a British General, possibly General Archer, that they would not be turned over to the Soviets. This soon changed however and they were turned over to the USSR a few weeks later, many of them being executed, including several of the German officers serving in those units, and the rest doing hard labour for a long time.

Commanders  
Generalleutnant Helmuth von Pannwitz (25 Feb 1945 - 9 May 1945)

Chef des Stabes  
Oberstleutnant Günther von Steinsdorff (25 Feb 1945 - 9 May 1945)

Area of operations  
Yugoslavia & Albania (Jan 1945 - May 1945)

Holders of high awards
Holders of the German Cross in Silver (1)
- Schwerdtfeger, Horst Dr. 20.04.1945 Oberstabsveterinär Korps-Veterinär XV. SS-Kosaken–Kavallerie-Korps

Order of battle - Korpstruppen
Aufklärungs-Abteilung XV.SS-(Kosk.)Kav.Korps
Pionier-Führer XV.SS-(Kosk.)Kav.Korps
Nachrichten-Führer XV.SS-(Kosk.)Kav.Korps
Pionier-Regiment XV.SS-(Kosk.)Kav.Korps

Cossack troops raising their flag

(Courtesy of John)

Sources used

Christopher Ailsby - Hitler's Renegades: Foreign nationals in the service of the Third Reich
Roger James Bender & Hugh Page Taylor - Uniforms, Organization and History of the Waffen-SS, vol 2
Georges M. Croisier - Waffen-SS (PDF)
Dr Jeffrey T. Fowler - Axis Cavalry in World War II
Steve Kane - Waffen-SS Forces in the Balkans: A checklist (in World War II Journal, Vol 7)
Richard Landwehr - Steadfast Hussars: The Last cavalry Divisions of the Waffen-SS
Kurt Mehner - Die Waffen-SS und Polizei 1939-1945
Marc J. Rikmenspoel - Waffen-SS Encyclopedia
John E. Strandberg - Horsepower: The use of horses by the German armed forces during World War II (in Military Advisor Vol 21, No 4)
Mark C. Yerger - Waffen-SS Commanders: The Army, corps and divisional leaders of a legend (2 vol)

Reference material on this unit

Peter J. Huxley-Blythe - Under the St. Andrew's Cross: Russian & Cossack Volunteers in World War II
François de Lannoy - Pannwitz Cossacks: Les Cosaques de Pannwitz 1942 - 1945
Richard Landwehr - Steadfast Hussars: The Last cavalry Divisions of the Waffen-SS