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).
In 1757 he was made lieutenant-general of the ordnance, and transferred to a fourth colonelcy.
In the following year he was promoted to a colonelcy.
In 1770 Granby, worn out by political and financial trouble, resigned all his offices, except the colonelcy of the Blues.