David Dundas, was L.Col. David Watson’s nephew. He was the third son of Robert Dundas and Elizabeth Watson. David was born in 1735. His uncle arranged a placement for him to join William Roy on the Military Survey, as a Board of Ordnance cadet. He was made assistant quartermaster in 1752 ( aged 17) and took charge of the eastern part of the Lowlands Survey which was completed by 1755. He was then commissioned and there followed a very distinguished army career culminating in Quartermaster-General in 1797 and Commander-in-Chief in 1809. A great advocate of officer training, he wrote the first manuals on the subject. He was lifelong friend to William Roy as well as a military colleague.