A three-quarter-length portrait to right in a grey silk coat, a silver-laced yellow silk waistcoat and a grey bag wig. With his left hand, he gestures towards the 'Cornwall', 80 guns, with the flag of a vice-admiral of the white, in the right background.
It is not clear when Chadwick entered the Navy but he was promoted lieutenant on 20 July 1737 and appointed to the 60-gun 'Augusta' the following year. Made commander on 23 February 1742, he took command of the sloop 'Rupert's Prize' (6 guns). Chadwick rose to captain on 16 January 1744, commanding the 20-gun 'Gibraltar'.
The portrait was painted after June and probably before November 1744, when Chadwick sailed as flag-captain to Vice-Admiral Davers in the 'Cornwall' with a squadron to the West Indies. On the death of Davers, Rear-Admiral Knowles took his place and, in March 1748, the 'Cornwall' took the principal part in the reduction of the French-occupied fort at Port Louis, Guadalope. Chadwick died in June following, while still in the 'Cornwall'.

This portrait was reattributed to George Knapton in October 2006, having previously been thought to be by Thomas Hudson.