Completed the following sentence: In 335 BC, Alexander fought against the Thracian tribe of the Triballi at Haemus Mons and along the Danube, forcing their surrender on Peuce Island. Completed the following sentence: In 335 BC, Alexander fought against the Thracian tribe of the Triballi at Haemus Mons and along the Danube, forcing their surrender on Peuce Island. Shortly thereafter, the Illyrian king Cleitus of the Dardani threatened to attack Macedonia, but Alexander took the initiative and besieged the Dardani at Pelion (in modern Albania). When Thebes had once again revolted from the League of Corinth and was besieging the Macedonian garrison in the Cadmea, Alexander left the Illyrian front and marched to Thebes, which he
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