During the childhood of shah Shapur II (r. 309 - 379), Arab nomads made several incursions into the Sasanian homeland of Pars, where they raided Gor and its surroundings. Furthermore, they also made incursions into Meshan and Mazun. At the age of 16, Shapur II led an expedition against the Arabs; primarily campaigning against the Iyad tribe in Asoristan and thereafter he crossed the Persian Gulf, reaching eastern Arabia. He proceeded to attack the Banu Tamim in the Al Hajar Mountains. Shapur II reportedly killed a large number of the Arab population and destroyed their water supplies by stopping their wells with sand.