Henry Ireton

June 14, 1645 · 6,100 total casualties

Naseby was the decisive battle of the English Civil War. The King lost his best infantry — approximately 5,000 were captured — along with his artillery, his baggage train, and his secret correspondence. He would never again field a comparable force. The battle was the New Model Army's finest hour: trained, paid, and commanded by merit rather than birth, it had proven itself the finest military force England had ever produced. The publication of Charles's captured letters, showing him seeking Irish Catholic and foreign help, shattered whatever remained of moderate Royalist opinion.

August 17–19, 1648 · 4,100 total casualties

Preston ended the Second Civil War and had enormous political consequences. Cromwell and the New Model Army officers had already been radicalizing — they saw Charles's negotiations to bring a Scottish army into England as the ultimate betrayal, a 'Man of Blood' deliberately causing a second round of slaughter. The letter Cromwell wrote from Preston urging Parliament to bring Charles to account shows the mental transition that would lead directly to Pride's Purge and the trial and execution of the King.

January 30, 1649 · 1 total casualties

The execution of Charles I was a world-historical event: the first time in European history that a reigning monarch was formally tried and executed by his own subjects under legal process. It announced to the world that kings were not sacred and untouchable — they were accountable. The shock waves reverberated across every European court. The act simultaneously radicalized English politics, creating a generation of Royalist martyrs, and established a revolutionary precedent that would echo through the French and American revolutions over a century later.