He became major in 1787, visited England in 1789, and purchased a lieutenant-colonelcy in 1790, returning to India in the following year.
Promotion followed in 1749 to a majority, and in 1750 to the lieutenant-colonelcy of the loth, with which he served in Scotland.
He was given the colonelcy of the 10th (Lancashire Fusiliers), but was too late to take part in the battle of Culloden.
In 1747-1748 he was again with the duke of Cumberland in the Low Countries, and in 1749 was transferred to the cavalry, receiving the colonelcy of the 7th (3rd) Irish Horse (Carabineers).
The few and miserable triumphs of Sweden during the Seven Years' War were due almost entirely to young Sprengtporten, and he emerged from it with a lieutenant-colonelcy, a pension of X20, and the reputation of being the smartest officer in the service.
In 1770 Granby, worn out by political and financial trouble, resigned all his offices, except the colonelcy of the Blues.
In 1636 he entered parliament as member for Stafford, and during the Civil War held a colonelcy in the parliamentary army.
In 1753 he was given the colonelcy of the 14th foot, and in 1754 he became a major-general.
He commanded his regiment at the battles of Talavera and Busaco, and in 1810 received a colonelcy and the appointment of A.D.C. to the king.
In 1768 the king, who had had a quarrel with Amherst, made amends by giving him another colonelcy; in 1770 he was made governor of Guernsey; and two years later, though not yet a full general, he was made lieutenant-general of the ordnance and acting commander-in-chief of the forces.
He won his colonelcy by his ability and valour at the battles of Alibunar and Lagerdorf in 1848.