Gilnockie Castle lies immediately left of the north side of Canonbie Bridge, occupying a strong defensive site and was once the seat of the Armstrongs, Lairds of Mangerton. It was the home of John Armstrong of Gilnockie and was unfinished at the time of his death. Not much of the castle remains. When James V became king of Scotland, one of his objectives was to restore order in his kingdom and to pacify the borders. He commanded an army of 12,000 men. He ordered all earls, lords, barons, freeholders and gentlemen to meet at Edinburgh with a month's supplies, and then to proceed to Teviotdale and Annandale. The nobles were to bring their dogs with them. After hunting for a few days, the King offered safe conduct to Johnnie Armstrong for an audience. John Armstrong was the laird of Kilnockie and was felt by all Scots to be as good a chieftain as there was within the borders, either in Scotland or England. Johnnie Armstrong may have been a loose-living man and although he never molested a Scotsman, he was of such a force that from the Scots border to Newcastle of England there were not many estates who did not pay tribute to him. When Johnnie came into the king's presence there was no trial but a hanging of Johnnie and his men in the trees of Carlanrig churchyard. There is a legend that persists to this day that the dule trees upon which they were hung withered and died and that the same has happened to any trees which were planted since. John and his men would have fought when they realized what was to happen to them but chances are that they were seized and restrained before they could do so. He is said to have shouted to the King. "I have asked grace at a graceless face." His execution weakened James' authority in the borders and was a grave mistake on the King's part.