Fairfax’s force in the English Civil War (3,5,4)

I believe the answer is:

new model army

(Other definitions for new model army that I've seen before include "Parliamentarians" , "Cromwell's fighters" , "Civil War parliamentary force" , "Cromwell's fighting force" , "Cromwell's well-trained military machine after 1645" .)

I've seen this clue in The Guardian.

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