The introduction of Hellenistic Greece started when Alexander the Great conquered the Achaemenid Empire and further regions of Central Asia in 334 BCE. Alexander would then venture into Punjab (land of five rivers), which was conquered by Darius the Great before him. Alexander crossed the Indus and Jhelum River when defeating Porus and appointing him as a satrap following the Battle of the Hydaspes. Alexander's army would mutiny and retreat along the Beas River when confronted by the Nanda Empire, thus wouldn't conquer Punjab entirely.