He was a retainer in the household of Charles I, and was employed in training the royal family in military exercises.
Gwynne was with Montrose in his last unhappy attempt in 1650, and joined the forces of General John Middleton in 1654.
When that enterprise also failed he served James, Duke of York, and was with him at the fight before Dunkirk in 1658, and in Flanders.
The manuscript is a very neat one, and is preceded by several letters to persons of consequence whose interest the author was desirous of securing.
John Grahame of Lifford, near Strabane, Ireland, into whose hands it had fallen by accident.