[3][5] For the help he gave the Queen persuading the Parliament of Scotland to support the Act of Union, he was created Earl of Greenwich and Baron Chatham in 1705.

[6] He then returned to the continent and, having been promoted to major-general early in 1706, served as a brigade commander under Marlborough at the Battle of Ramillies in May 1706 and at the Siege of Ostend in June 1706.

[6] After being appointed colonel of Prince George of Denmark's Regiment in 1707, he went on to command a brigade at the Battle of Oudenarde in July 1708 and at the Siege of Lille in Autumn 1708.

[6] Appointed a Knight of the Order of the Garter in December 1710, Campbell was promoted to full general and given command of all British forces in Spain at the instigation of the Harley Ministry in January 1711.

The Harley government was negotiating an agreement with France which would see Britain recognise Philip V of Spain, in exchange for being allowed to retain Gibraltar and Minorca.

[8] Campbell arrived back in London early in March 1716, and at first stood high in the king's favour, but in a few months was stripped of his offices.

[13] Promoted to field marshal on 31 January 1735,[14] Campbell was stripped of his post as Master-General of the Ordnance and the colonelcy of the Royal Horse Guards for opposing the Government of Robert Walpole in 1740.

[17] However, disapproving the measures of the new administration, and apparently disappointed at not being given the command of the army, he shortly resigned all his posts, and spent the rest of his life in privacy and retirement.

[5] Campbell died at Sudbrook Park, Petersham on 4 October 1743 and was buried in Westminster Abbey; his grave is marked by a small lozenge stone to the north east of Henry VII's tomb.