Pirates from Sind attacked Arab's ships, so Muhammad ibn Qasim, an Arab general, was sent with warriors to get revenge on Sind when he was only 17. Muhammad achieved many victories against the Sind civilizations and was able to obtain territories from the Sind civilizations and the Indus valley for the Umayyad Empire. Muhammad ibn Qasim was later killed by his father-in-law, who became the new caliph.