Battle of Naseby (1645)
Fought on 14 June 1645 during the First English Civil War, the Battle of Naseby was the decisive military engagement in which Sir Thomas Fairfax and Oliver Cromwell's New Model Army shattered the main Royalist field army under King Charles I.

From the source
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Editorial reading
The Battle of Naseby unfolded across approximately 614 hectares of Northamptonshire undulating farmland (NGR: SP6847879975). Fairfax and Cromwell decisively defeated King Charles I and Prince Rupert. The royalist cause never recovered from the loss of its veteran infantry and artillery train. Formally designated as a Registered Historic Battlefield on the National Heritage List for England (List Entry 1000023).
Recommendation
Walk the registered battlefield of Naseby, featuring the Cromwell and Fairfax memorial obelisks, Sulby Hedges, and expansive open vistas.
Sources
National Heritage List for England (Historic England) — Open Government Licence v3.0