Source The Black Watch Regiment - Tommy B. Smyth Archivist
Belhousie Castle Perth Scotland

John Dumbreck
I have traced a man of this name. He served originally in Lord Huntly's Independent Company, which was raised in 1790. The Letters of Service are dated 13 October 1790. Huntly was given a commission in The Black Watch on 25 January 1791 and brought his Company to the Regiment. John Dumbreck is listed in the Roll of the Company.
Lord Huntly's Black Watch Company
In: Territorial Soldiering in the North-East of Scotland During 1759-1814 John Malcolm Bulloch
Aberdeen: New Spalding Club, 1914. pps 129-40.

Pte John Dumbreck is listed in the Muster Roll, 25/12/1790-24/6/1791. Received from Marquis of Huntly's Company 25/1/1791.
Muster Rolls, 1784-94 BWA 0004

He is also listed in the Effective Size Record of Capt James Stewart's Company, Edinburgh Castle,
6 Sept 1791.
The details are as follows:-
John Dumbreck Born Parish of Dundurcus, County of Banff. Age 22 years Height 5' 6 3/4" Fresh complexion, round visage, brown eyes, brown hair. Trade Mason.
BWA 0008

The Record for 6 June 1792 gives the above except Height 5' 7 1/4". Parish of Birth: Mortlich [Mortlach].

I have also checked the Casualty Rolls, 1804-10, but have found no listing of John Dumbreck being killed at Corunna.
Account of Deceased Men BWA 0025