Edward IV’s decision to marry Elizabeth Woodville was the primary cause of his exile in 1470:

Structure:
Introduction
What does Charles Ross argue about this point – add a lot of factual evidence – what problems did it cause e.g. she was from a low family and had a Lancastrian ex husband
Find a historian that disagrees with Ross – add some evidence
Use a source (see sources below) – question reliability and context – analyse certain phrases that back up my point – how useful is it – does it support the argument?
Include short sources/illustrative sources
Offer some counter arguments – there were existing feuds between Rivers and Warwick BUT this made Edward’s marriage choice even worse?
Weight it up and come to your own conclusion as to why the marriage was so important in the cause of Edward’s exile