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General Sobieski, later to become King Jan III Sobieski, held the prestigious military title of "Grand Hetman of the Crown" in the Polish-Lithuanian Commonwealth. This position made him the supreme commander of the Polish army, responsible for its organization, training, and leadership during wartime. Sobieski's expertise and success as a military strategist and tactician gained him renown throughout Europe, paving the way for his eventual rise to the Polish throne.