XV. SS-Kosaken-Kavallerie-Korps was formed Jan 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.

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

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

Richard Landwehr - Steadfast Hussars: The Last cavalry Divisions of the Waffen-SS

Marc J. Rikmenspoel - Waffen-SS Encyclopedia

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