In 1794, after a short period of home service, he was again in India. In the same year he became major-general, and in 1797 Commander-in-Chief of the Madras Army. Up to 1800 be commanded the troops in the presidency, and for a short time he exercised the civil government as well. In December 1798 he was appointed by Lord Mornington, the governor-general, to command the field army which was intended to attack Tipu Sultan, and in a few months of campaigning Harris reduced the Kingdom of Mysore and stormed the great stronghold of Seringapatam, where the Tipu died in its defence.