At the point when did the Emporer advise the family he was surrendering ?
When the Jacobite forces sent a flag of truce to the castle , and threatened , unless it were surrendered , to burn Valleyfield , he replied that in that case he would have his majesty 's cruisers burn down Wemyss Castle : the Earl of Wemyss had a son Lord Elcho who was a general in the service of the Young Pretender .