Ambur.
This strong fortress was held by a garrison of 500 Sepoys, under Captain Calvert, and a detachment of Mysore troops under Mukhlis Khan. This man had assumed the status of an independent chief, but being suspected of intriguing with Hyder Ali, was arrested by Calvert. Hyder laid siege to the place November 10, 1767; but Calvert, now secure from treachery within, held out with his small garrison till December 6, when the approach of a relieving force obliged Hyder to raise the siege.