Maurya Empire replaces Nanda Empire
Meanwhile, Alexander the Great was leading his Indian campaigns and ventured into Punjab. His army mutinied at the Beas River and refused to advance farther eastward when confronted by another army. Alexander returned to Babylon and re-deployed most of his troops west of the Indus River. Soon after Alexander died in Babylon in 323 BCE, his empire fragmented into independent kingdoms led by his generals.The Maurya Empire was established in the Magadha region under the leadership of Chandragupta Maurya and his mentor Chanakya. Chandragupta was taken to Taxila by Chanakya and was tutored about statecraft and governing. Requiring an army Chandragupta recruited and annexed local military republics such as the Yaudheyas that had resisted Alexanders Empire. The Mauryan army quickly rose to become the prominent regional power in the North West of the Indian subcontinent. The Mauryan army then conquered the satraps established by the Macedonia ns. Ancient Greek historians Nearchus, Onesictrius, and Aristobolus have provided lot of information about the Mauryan empire. The Greek generals Eudemus and Peithon ruled in the Indus Valley until around 317 BCE, when Chandragupta Maurya (with the help of Chanakya, who was now his advisor) fought and drove out the Greek governors, and subsequently brought the Indus Valley under the control of his new seat of power in Magadha.Chandragupta Maurya's ancestry is shrouded in mystery and controversy. On one hand, a number of ancient Indian accounts, such as the drama Mudrarakshasa (Signet ring of Rakshasa – Rakshasa was the prime minister of Magadha) by Vishakhadatta, describe his royal ancestry and even link him with the Nanda family. A kshatriya clan known as the Mauryas are referred to in the earliest Buddhist texts, Mahaparinibbana Sutta. However, any conclusions are hard to make without further historical evidence. Chandragupta first emerges in Greek accounts as "Sandrokottos". As a young man he is said to have met Alexander. Chanakya is said to have met the Nanda king, angered him, and made a narrow escape.Conquest of the Nanda Empire
Historically reliable details of Chandragupta's campaign against Nanda Empire are unavailable and legends written centuries later are inconsistent. Buddhist, Jain, and Hindu texts claim Magadha was ruled by the Nanda dynasty, which, with Chanakya's counsel, Chandragupta conquered Nanda Empire. The army of Chandragupta and Chanakya first conquered the Nanda outer territories, and finally besieged the Nanda capital Pataliputra. In contrast to the easy victory in Buddhist sources, the Hindu and Jain texts state that the campaign was bitterly fought because the Nanda dynasty had a powerful and well-trained army.The Buddhist Mahavamsa Tika and Jain Parishishtaparvan records Chandragupta's army unsuccessfully attacking the Nanda capital.  Chandragupta and Chanakya then began a campaign at the frontier of the Nanda empire, gradually conquering various territories on their way to the Nanda capital. He then refined his strategy by establishing garrisons in the conquered territories, and finally besieged the Nanda capital Pataliputra. There Dhana Nanda accepted defeat. The conquest was fictionalised in Mudrarakshasa play, it contains narratives not found in other versions of the Chanakya-Chandragupta legend. Because of this difference, Thomas Trautmann suggests that most of it is fictional or legendary, without any historical basis. Radha Kumud Mukherjee similarly considers Mudrakshasa play without historical basis.These legends state that the Nanda king was defeated, deposed and exiled by some accounts, while Buddhist accounts claim he was killed. With the defeat of Dhana Nanda, Chandragupta Maurya founded the Maurya Empire.
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