Bactrians and Parthia became independent from the Syrian empire in the middle of the third century BCE
Demetrius, the Greek ruler of Bactria invaded Afghanistan and Punjab and occupied them
From Taxila, he sent two of his commanders. Appolodotus who conquered the Sindh and marched up to Ujjain and Menander extended his rule up to Mathura and from there he made attempts to capture Pataliputra
Menander was stopped by the army of Vasumitra, the grandson of Pushyamitra Sunga
Menander was also known as Milinda and the capital of his kingdom was Sakala (Sialkot)
Buddhism and his dialogues with the Buddhist monk Nagasena was compiled in Pali work, Milindapanho. He also embraced Buddhism