Macartney was the governor of Madras (now known as Chennai) from 1781 to 1785. During his tenure as governor, renovation and strengthening of the walls of Fort St. George was commenced after the siege by Thomas Lally, and completed in 1783. It was also during this time that most of the buildings and barracks in the western portion of the Fort were erected. The Palace Street, the Arsenal, the Hanover square and the Western Barracks were constructed during this time. The streets in the eastern side of the Fort were also altered.