Śālva was one of the kings who had been defeated at the time of Rukmiṇī-devī’s marriage. Having vowed then that he would rid the earth of all the Yādavas, he began worshiping Lord Śiva each day by eating only a palmful of dust. After a year had passed, Śiva appeared before Śālva and asked him to choose a benediction. Śālva begged for a flying machine that could go anywhere and that would strike terror into the hearts of demigods, demons and humans alike. Lord Śiva granted this request and had Maya Dānava construct for Śālva a flying iron city named Saubha. Śālva took this vehicle to Dvārakā, where he and his huge army laid siege to the city. From his airplane Śālva bombarded Dvārakā with tree trunks, boulders and other missiles, and he produced a mighty whirlwind that obscured everything with dust.