The SS-Sturmbrigade Wallonien (briefly known as SS-Freiwilligen-Brigade Wallonien) was formed from Wallonische Infanterie Bataillon 373 of the Heer June 1943. It was redesignated 5. SS-Freiwilligen-Sturmbrigade Wallonien March 1944.

While the brigade was attached to the Wiking division under Herbert Gille it was evaluted by the division staff and Gille wrote:

The Sturmbrigade is lacking in adequate offensive training and is suitable only for defensive actions. This could be remedied somewhat by using small units for scouting and assault troop operations, which gives some experience in offensive undertakings. (2)

See also Operations of Encircled Forces: German Experiences in Russia.

Commanders

SS-Sturmbannführer Lucien Lippert (1 June 1943 - 13 Feb 1944) KIA (1)
SS-Standartenführer Leon Degrelle (13 Feb 1944 - ? Mar 1944) [Political leader, not military leader]

Order of battle

Staff
Infantry Battalion (mot)
- 3 x Infantry Company
- Heavy Weapons Company
5. Company (Anti-Tank)
6. Company (Anti-Aircraft, 2cm)
7. Company (Anti-Aircraft, 8,8cm)
8. Company (Artillery)
9. Company (StuG)

Notable members

Louis Fierens (Unit chaplain and the first Catholic chaplain within the Waffen-SS)

Men from SS-Sturmbrigade Wallonien at SS-Junkerschule Bad Tölz in 1943, note Belgian sleeve shield

(Courtesy of Bundesarchiv/Wikimedia, licensed under Creative Commons Attribution ShareAlike 3.0 Germany)

Footnotes

1. Lucien Lippert was killed by a sniper during the fighting at Nowo-Buda.
2. "5. SS-Sturmbrigade Wallonie" by Richard Landwehr, in Siegrunen, No 79, page 118.

Sources used

Christopher Ailsby - Hitler's Renegades: Foreign nationals in the service of the Third Reich
Eddy De Bruyne & Marc Rikmenspoel - For Rex and for Belgium: Leon Degrelle and Walloon Political & Military Collaboration 1940-45
Richard Landwehr - The "Wallonien": The history of the 5th SS-Sturmbrigade and 28th SS Volunteer Panzergrenadier Division
Richard Landwehr - 5. SS-Sturmbrigade "Wallonie"  (in Siegrunen, No 79)
Kurt Mehner - Die Waffen-SS und Polizei 1939-1945

Reference material on this unit

Eddy De Bruyne & Marc Rikmenspoel - For Rex and for Belgium: Leon Degrelle and Walloon Political & Military Collaboration 1940-45
Eddy De Bruyne - Les Wallons meurent à l'Est
Léon Degrelle - La Campagne de Russie 1941-1945
Richard Landwehr - The "Wallonien": The history of the 5th SS-Sturmbrigade and 28th SS Volunteer Panzergrenadier Division
Jean Mabride - Brigade d'assaut Wallonie
Jean Mabride - Division de choc Wallonie