Opinions are made to be changed - or how is truth to be got at?
Though sages may pour out their wisdom's treasure there is no sterner...
You do have to change things as warfare changes.
I made a very conscious effort to finish 'The Cypress House' before 'So Cold the River' launched because I thought that would help build a buffer between my writing and any impact that came from either the success or the failure of that first book.