An exchange of prisoners in 1523

While looking for details of life at Aberdour Castle in the seventeenth century, I found a letter from 1523, addressed to George Douglas of Pittendreich from Antony Ughtred, captain of Berwick. The English soldiers named here were called 'whitecoats'. Ughtred wanted to return Scottish prisoners in an exchange at Bunkle castle, near Reston in the…