Wiki on the movie here
I can still remember the anticipation I had as a 9 year old (see pic) when news of this film came out - I remember my dad bringing home a clipping from a newspaper with Richard Harris in a lobster pot. Looking at it now it is still an enjoyable movie - probably still the best ECW movie...not that there is much competition. I suppose this movie and the Ladybird book on Cromwell both formed my ideas of what the Civil War was like. Of course the 'troubles' in Ireland caused huge chunks of this film to be cut before release though the souvenir foyer booklet still had stills from that sequence. Read a deconstruction of the Ladybird Cromwell book here.