What is it supposed to do? Everything you write must be related to the question, and without a plan it is all too easy to lose focus and write irrelevant nonsense.
Archaeology crosses over into science, and with that comes scientific considerations such as how archaeological evidence has been gathered — the methods used, their reliability, whether or not they could have been tampered with, how accurately they were recorded, and so on.
At its core an essay is simply an argument. Revise your first draft extensively.
If you're really struggling - or just curious - you can also look into the Essay Writing Service from ourselves here at Oxbridge Essays. It is here that you draw together the threads of your argument and hammer home your points, leaving the reader in no doubt as to your answer.
Begin your next sentence like this: "To be convinced by my claim, the first thing a reader needs to know is. The same rules apply: each paragraph deals with one idea, one subject.