The following excerpt is from, http://www.scotwars.com/html/battle_of_dunbar.htm:
In addition to the 3,000 Scots killed at Dunbar, another 10,000 were taken prisoner. Some English historians say Oliver Cromwell lost only 40 men killed and wounded. But that has to be taken with a grain of salt, given the intensity of the first hour of fighting. After the battle ended, Cromwell simply could not handle 10,000 prisoners. About 5,000 Scots described in an English document as "those wounded and those fatigued by flight" were released almost immediately on parole. But Cromwell ordered 5,100 Scottish soldiers marched south from Dunbar into captivity in England as quickly as possible, fearing the Scots might organise a counter-attack aimed at freeing and re-arming the prisoners. The English also had big plans for the prisoners they kept. A document from the English Calendar of State Papers issued during the period spells out the disposition of "Scotch rebel prisoners." Initially, the plan was to "execute all ministers and officers." That was subsequently
changed to execution of one in 10 "of the common sort . . .one forced to confession . . .the rest sent to the plantations." There is no evidence of arbitrary executions. Instead, the Scots were all to be enslaved, sold and deported to Ireland or across the Atlantic for indentured servitude in the New World colonies. Fighting men from the losing side had suddenly become beasts of burden, a marketable commodity on a grand scale. But first came what could well be called the Durham Death March, a disgusting stain on English military and social history generally glossed over by British historians then and now.
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