Discrepancies and Limited History of Fort Watauga? Need Help/Answers, Please

I'm posting this here because I have reached yet another stumbling block in my family research. Online resources seem terribly limited and mostly conflicting. I even came across a thesis regarding the subject of the history of Fort Watauga. While most have similar accounts of the siege of 1776, the college thesis, http://dc.etsu.edu/cgi/viewcontent.cgi?article=2260&context=etd) in particular, says nothing about later instances when the Cherokee attacked. This leaves me unable to verify the family account that the fort was, again, under attack during the spring of 1780. Also, although historians such as Ramsey, give some information regarding the exact location of the fort, he seems to be 'off' according the the thesis I read.

My sixth great-grandmother died at Fort Watauga and was buried on the same day somewhere in the surrounding forest in an unmarked grave, since my sixth great-grandfather, then a Lt. Colonel in the militia, was concerned the Cherokee would desecrate her grave. Apparently, the funeral took place under the cover of night and was completed by around midnight, since the Cherokee were known for attacking at dawn. If the exact location of this fort truly is in question, this could account for why her remains have never been located.

I have been unable to find any information about this particular attack, to know how long it ran, how devastating it was and to even know if this is what happened to the Fort, since the thesis suggested no one really knows the full history. Certainly, I haven't found much about it online.

There was also a website that suggested the siege of 1776 lasted so long, that the settlers were unable to plant their crops and were having to plead for flour and such. (http://www.rootsweb.ancestry.com/~varussel/indian/10.html) This is from an unpublished work, so I cannot put much credence into it, nor have I been able verify this. Especially, since the source cited  in the college thesis, (Draper), gave an account that three or four men dared to venture out of the fort at one point to travel the four miles to the plantation of John Sevier for some corn.

Ah, excuse me, if the people were more or less trapped in said fort unable to plant, how was it John Sevier could do so? (Dang, he's good, but I didn't think he had  on a 'Superman cape' underneath that inevitable hunter's shirt.) Let's get real, here, folks.

Does anyone have any credible accounts as to the history of this fort? Or anything that may help me gather the truth? Please, and thank you, in advance.