<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Historians divide the Chola Reign into three distinct phases . The first era is the period of Early Cholas . The second phase is of Vijalaya Cholas and the final phase in the empire was the Chalukya Chola period . </P> <P> The Cholas were at the height of their power from the later half of the 9th century through to the early 13th century . Under Rajaraja Chola I and his son Rajendra Chola I, the dynasty became a military, economic and cultural power in Asia . During the period 1010--1200, the Chola territories stretched from the islands of the Maldives in the south to as far north as the banks of the Godavari River in Andhra Pradesh . Rajaraja Chola conquered peninsular South India, annexed parts of Sri Lanka and occupied the islands of the Maldives . Rajendra Chola sent a victorious expedition to North India that touched the river Ganges and defeated the Pala ruler of Pataliputra, Mahipala . He also successfully raided kingdoms of Maritime Southeast Asia . </P> <P> The earliest Chola kings of whom there is tangible evidence are mentioned in the Sangam literature . Scholars now generally agree that this literature belongs to the first few centuries of the common era . The Sangam literature is full of names of the kings and the princes, and of the poets who extolled them . Despite literature that depicts the life and work of these people, these cannot be worked into connected history . </P>

What were the achievements of the navy of rajendra chola
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