The Nanda Empire, at its greatest extent, extended from Bengal in the east, to the Punjab region in the west and as far south as the Vindhya Range. The Nanda dynasty was famed for their great wealth. The Nanda dynasty built on the foundations laid by their Haryanka and Shishunaga predecessors to create the first great empire of north India. To achieve this objective they built a vast army, consisting of 200,000 infantry, 20,000 cavalry, 2,000 war chariots and 3,000 war elephants (at the lowest estimates). According to the Greek historian Plutarch, the size of the Nanda army was even larger, numbering 200,000 infantry, 80,000 cavalry, 8,000 war chariots, and 6,000 war elephants. However, the Nanda Empire did not have the opportunity to see their army face Alexander the Great, who invaded north-western India at the time of Dhana Nanda, since Alexander was forced to confine his campaign to the plains of Punjab and Sindh, for his forces mutinied at the river Beas and refused to go any further upon encountering Nanda and Gangaridai forces.