[1] [2][3] He sailed Governor Edward Cornwallis aboard HMS Sphinx to establish Halifax, Nova Scotia (1749).

[8] He also fought in the action of 5 April 1757 in the strait of Gibraltar when he commanded HMS Princess Louisa and the French fleet successfully evaded the British naval forces to arrive at Louisbourg.

He was buried at St Cadog's Church in Llangadog, Wales and a stone monument was mounted on the wall.

[15][16][17][18][19] William died in 1796 and was buried in the St. Cadog's church along with his father John and grandfather Thomas, both of whom were High Sheriffs of Carmarthenshire.

[20] William's father John created a monument in St. Cadog's church to his parents Thomas (d. 1720) and Rachel Lloyd (d.1702).