While Lord Muruga waged war against Surabadman at Mahendran Palli (5 KMS from here), Sura Badman transformed his human form into a peacock and began to attack. At that time Indran changed his form into a Peacock and Lord Muruga sat on the Peacock (INDRA) and began to attack Sura Badman.This happened here.Hence THIRU MAILAADI.