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The Warden's son was Adam Johnstone who was the first Laird of Johnstone. Adam Johnstone fought at the Battle of Sark in 1448. Adam's son fought for James II of Scotland in the desperate struggle against the Clan Douglas and was instrumental in suppressing that rebellion against the Crown. The king rewarded him with the lands of Buittle and Sannoch near Threave Castle that had previously belonged to the Douglases of Galloway.