Thai Pusam

The origin of Lord Skanda, the purpose of His avatara and its significance are of much importance to all seekers after Truth. During the battle between the Asuras and the Devas, the latter were defeated several times by the former. The Devas were unable to resist the onslaught of the Asuric forces. In despair, they approached Lord Siva and entreated to give them an able leader under whose heroic leadership they might obtain victory over the Asuras. They surrendered themselves completely and prayed to Lord Siva sincerely. The gracious Lord granted their request by creating mighty divine warrior, Lord Skanda, out of his own power or Achintya Sakti. This great son of Lord Siva at once assumed leadership of the celestial forces, originated them, inspired them and attacked the asuric forces. The asuras were routed and a glorious victory was gained by the Devas.
Wikipediahttp://en.wikipedia.org/wiki/Thaipusam