Myths of the Asuras
"The Asuras formerly lived in the Trāyastriṃśa world, on the peak of Mount Sumeru, with the other gods of that world. When Śakra became the ruler of that world, the Asuras celebrated by drinking a lot of Gandapāna wine, a liquor so strong that Śakra forbade the other gods to drink it. Weakened by their drunkenness, the Asuras could not resist when Śakra had the whole lot of them thrown over the edge of Trāyastriṃśa into what would become the Asura-world at the base of Sumeru. A tree grows there called Cittapātali; when the Asuras saw it blossom, they saw that it was different from the Pāricchattaka (Sanskrit: Pāriyātra) tree which had grown in their old home, and they knew that they were dispossessed.
They now meditated on war. In armor and weapons, they climbed up the steep slopes of Sumeru "like ants". Śakra set out to meet them, but was forced to retreat because of their numbers. Passing through the forest where the garuḍas live on his flying chariot, Śakra saw that his passage was destroying the nests of the garuḍas and ordered his charioteer Mātali to turn back. When the pursuing Asuras saw Śakra turn about, they felt certain that he must be coming back with an even larger army, and they fled, ceding all the ground they had gained.
Despite their many wars, there was eventually a partial concord between the Trāyastriṃśa gods and the Asuras. This came about because Śakra fell in love with Sujā, daughter of the Asura chief Vemacitrin. Vemacitrin had given Sujā the right to choose her own husband at an assembly of the Asuras, and she chose Śakra, who had attended disguised as an aged Asura. Vemacitrin thus became Śakra's father-in-law."