The Battle of Pollilur, also known as the Battle of Polilore or Battle of Perambakam, took place on 10 September 1780 at Pollilur near the city of Kanchipuram in present-day Tamil Nadu state, India as part of the Second Anglo-Mysore War. It was waged between two forces commanded by Tipu Sultan of the Kingdom of Mysore, and Colonel William Baille of the British East India Company. The army of the East India Company surrendered and suffered a high number of casualties. It was the worst loss the British suffered on the subcontinent until Chillianwala.