prāvṛṭ-sūryam ivāmbudāḥ

sarvatah-all around; sara-kutena-by a dense shower of arrows; sakram-Indra; sa-ratha-with his chariot; sarathim-and with his chariot driver; chadayam asuh-covered; asurah-all the demons; pravrt-in the rainy season; suryam-the sun; iva-like; ambu-dah-clouds.