Watt became a Presbyterian minister in 1896. He served in Turriff, Aberdeenshire (1897) and Alloa (1901). In World War I, he was a chaplain to Britain’s Gordon Highlanders and Black Watch. His works include:
- The Tryst: A Book Of The Soul (Hodder & Stoughton, 1907)
- Scottish Life and Poetry (London: James Nisbet & Co., 1912
- In the Land of War
- The Soldier’s Friend
- The Heart of a Soldier (New York: George H. Doran Company, 1918)
- The Gordon Highlanders (Edinburgh, Scotland: W. P. Nimmo, Hay & Mitchell, 1918)
- While the Candle Burns (London: William Blackwood, 1933)
- The Scottish Ballads and Ballad Writing
Lyrics
- I Bind My Heart This Tide