He was the eldest son of Count Christian Christoph Clam-Gallas (1771–1838), patron of Beethoven, and Countess Josephine Clary-Aldringen (1777–1828).
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In 1848, called to Italy under the orders of General Joseph Radetzky, he commanded a brigade which distinguished itself at Santa Lucia, Vicenza and the Battle of Custoza.
The Oromo people, an ethnic group in Ethiopia also known as Gallas
The siege lasted until July 1630, when the city, already struck by a plague, was brutally put to the sack for three days and three nights by troops led by Count Aldringen and Gallas.