During the French and Indian War, Spry participated in the Siege of Louisbourg and served in Quebec after its surrender the following year.
[1] During the American Revolution, Spry was the commander of the Royal Engineers and in Halifax, Nova Scotia, strengthened Citadel Hill, built Fort Massey and Fort Needham, and oversaw the building of the Northwest Arm Battery at Point Pleasant.
In about 1770, while a captain, William Spry purchased some land in Nova Scotia and established the settlement known as Spryfield with the aid of stationed soldiers from the nearby Halifax garrison.
Spry died in 1802 and is supposedly buried under the clock tower of St Margaret's, Westminster.
[3] William was descended from the Spry family of Roseland, Cornwall, which bred many army and navy officers.