Hubert Man's notes on H. G. M. are as follows: 

Lieut. Colonel Henry Garnet Man son of Captain Peter Bruels Man was educated at Maidstone & Sandhurst where he was a cadet in I822.  He entered the army (54th foot) & went to Burma, he just missed the first Burmese war, but made some excellent sketches of the Burmese Positions near Arakan (Col. H. W. Man presented these 5 sketches to the Dorset Regt. in 1933). He returned to Sandhurst as an instructor in 1854 & held the appointment of Captain of a Company until 18-9-60, when he retired on full pay with the rank of Lieut. Colonel.  He then commanded the 2nd City of London Volunteers R. E. He was a first rate shot with a gun; his shooting diary (in India) is in the family’s possession. He was very sociable & popular, could sing a song play a musical instrument & generally make himself agreeable. He used to go & stay with the Scarletts near Chatham. He was also a keen trout fisherman. He married Eliza Garrard daughter of Colonel Garrard R. E. I remember her well; she is said to have been plain as a girl but her white corkscrew curls & sweet expression made her pretty & I well remember thinking her a beautiful old lady (when I was a small boy). She lived near Aunt Nellie at Carshalton.