[7] For his services at Bannockburn, Walter was appointed Warden of the Western Marches and was rewarded with a grant of the lands of Largs, which had been forfeited by King John Balliol.

[8] Following the liberation of King Robert the Bruce's wife, Elizabeth de Burgh, and daughter, Marjorie, from their long captivity in England in October 1314, Walter the High Steward was sent to receive them at the Anglo-Scottish Border and conduct them back to the Scottish royal court.

[9] During the absence of King Robert the Bruce in Ireland, Walter the High Steward and Sir James Douglas managed government affairs and spent much time defending the Scottish Borders.

In 1322, with Douglas and Thomas Randolph, he made an attempt to surprise the English king at Byland Abbey, near Malton in Yorkshire, but Edward escaped, pursued towards York by Walter the Steward and 500 horsemen.

[10] He married twice: He died on 9 April 1327 at Bathgate Castle and was buried in the Abbey Church of Paisley, alongside his first wife, Marjorie Bruce, and his five High Steward ancestors.