This is the greatest lacunae of the Indian civilization. Damn idiots -by and large- thought it was not worth their time to record any of their exploits, something the Chinese dutifully did.
But records of the Chola exploits, especially under the father-son duo can be found in the stone inscription in Gangai konda cholapuram and also in the Big temple. The Mahavamsa also gives a sketch of their exploits - albeit with a negative touch since these Shaivite kings were not particularly good to the Sinhalas.
BTW I dont agree that they could come out as "greatest generals"..There are simply too many others for that post. But they would certainly come out as two of the greatest kings India has ever produced. Not only because of their military exploits, but also for their indulgence in the finer aspects of life - like art, architecture, music etc. And it is certainly disgraceful that Indian history books which "glorify" the Mughal rule for more than 60 page did not find it fit to give even 2 pages worth to these sons of the soil.