An aspect of the sun god Re Auf was a ram-headed god who wore the solar disc and traveled at night through the Underworld waterways in order to reach the east in time for the new day; however, he still had to fight off the creatures of the Underworld. Demons and gods towed his boat along while Auf stood in a deck-house, over which was coiled the serpent Mehen who warded off the dangerous Apep. The boat of night was crewed by the gods Hu, Saa and Wepwawet.