He was the grandson of Sir Bevil Grenville and the younger brother of Charles Granville, 2nd Earl of Bath.
[1] Granville fought alongside his elder brother in the Imperial Army during the Battle of Vienna in 1683.
[1][2] He welcomed the Glorious Revolution of 1688 and led a force of Grenadiers in support of William of Orange at the Siege of Cork in September, 1690.
He had been appointed Captain of Deal Castle in February, 1690, but lost the position for political reasons, along with his colonelcy in the Guards and his captaincy of a man-of-war, in December of that year.
[1][2] He notably made four speeches attacking the conditions of the Royal Navy and was a member of the committee set up to make recommendations on relieving wounded seamen.