[2] Yorke served in the War of the Austrian Succession as an aide-de-camp to the Duke of Cumberland, and fought in the Battle of Fontenoy on 11 May 1745.
On 1 November 1749, he was appointed an aide-de-camp to the King, and on 18 March 1755, colonel of the 9th Regiment of Foot.
[1] During this period he also sat in the House of Commons for East Grinstead between 1751 and 1761,[1][4] for Dover between 1761 and 1774[1][5] and for Grampound between 1774 and 1780.
[1][6] He was appointed a Knight Companion of the Order of the Bath (KB) in 1761 and sworn of the Privy Council in 1768.
[7] Lord Dover married Christiana Charlotte Margaret, daughter of Johan Henrik, Baron de Stöcken, a Danish nobleman, in 1783.