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How did Cromwell defeat the Scottish army at the Battle of Dunbar?

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Painting of the Battle of Naseby shows cavalry and infantry clashing, with soldiers on horseback leading a charge and fallen fighters on the ground amid the chaos of battle. — English Civil Wars *Battle of Naseby*, by an unknown artist. The victory of the Parliamentarian New Model Army, under Sir Thomas Fairfax and Oliver Cromwell, over the Royalist army, commanded by Prince Rupert, at the Battle of Naseby (June 14, 1645) marked the decisive turning point in the English Civil War.

At the Battle of Dunbar on September 3, 1650, Oliver Cromwell secured a decisive victory over the Scottish army by exploiting tactical errors in the deployment of his opponent, David Leslie.

Although the English forces were outnumbered and suffering from sickness, Cromwell’s New Model Army veterans proved superior to the Scottish recruits. English commanders identified two critical weaknesses in the Scottish position: the Scottish left wing was trapped against the steep slopes of Doon Hill, and a natural depression in the ground provided "dead ground" that allowed English troops to redeploy under cover.

Under the cover of night and driving rain, Cromwell moved his forces to concentrate overwhelming strength against the Scottish right wing. At dawn, he launched a surprise attack. Despite an initial Scottish defense, the English line—bolstered by Cromwell’s reserves—broke the Scottish cavalry and infantry. The Scottish line was rolled up from right to left, leaving the army trapped between the hill and a ravine. The battle concluded in just one hour, resulting in approximately 3,000 Scottish deaths and 10,000 captures.1