A strong force under Edward, Prince of Wales, captured Kildrummy Castle on 13 September taking prisoner the King's youngest brother, Nigel de Bruce, as well as Robert Boyd and Alexander Lindsay, and Sir Simon Fraser. Boyd managed to escape but both Nigel de Bruce and Lindsay were executed shortly after at Berwick following King Edward's orders to execute all followers of Robert de Bruce. Fraser was taken to London to suffer the same fate. Shortly before the fall of Kildrummy Castle, the Earl of Athol made a desperate attempt to take Queen Elizabeth de Burgh, Margery de Bruce, as well as King Robert's sisters and Isabella of Fife. They were betrayed a few days later and also fell into English hands, Atholl to be executed in London and the women to be held under the harshest possible circumstances.