On 3 September 1650 Oliver Cromwell won a decisive victory over the Scottish Covenanters at the Battle of Dunbar - a victory that is often regarded as his finest hour - but the aftermath, the forced march of 5,000 prisoners from the battlefield to Durham, was one of the cruelest episodes in his career.
The march took them seven days, without food and with little water, no medical care, the property of a ruthless regime determined to eradicate...