The real conquest of India by the Muslims dates from the beginning of the eleventh century. In A.D. 1000, the head of a Turco-Afghan dynasty, Mahmud of Ghazni, first passed through India like a whirlwind, destroying, pillaging, and massacring. He justified his actions by constant references to the Koranic injunctions to kill idolaters, whom he had vowed to chastise every year of his live.
Mahmud was a zealous Muslim of the ferocious type then prevalent, who left it to be a duty as well as pleasure to slay idolaters. He was also greedy of treasure and took good care to derive a handsome profit from his holy wars”. In the course of seventeen invasions, in the words of Alberuni, the scholar brought by Mahmud to India: “Mahmud utterly ruined the prosperity of the country, and performed there wonderful exploits, by which the Hindus became like atoms of dust scattered in all directions, and like a tale of old in the mouth of the people. Their scattered remains cherish, of course, the most innervate aversion toward all Muslims”.
Mahmud began by capturing King Jaipal in the Punjab, and then invaded Multan in 1004. On conquering the district of Ghur, he forcibly converted the inhabitants to Islam. Mahmud accumulated vast amounts of plunder form the Hindu temples he desecrated, such as that of Kangra, which had five idols made of red gold with eyes formed of precious jewels. The Muslim conquest of Sind by Hajaj Ibn Yousef Al-Thaqafy known as “the head cutting murderer”.
Hajaj was the governor of Iraq, he ruled by the law of decapitation. He was recognized by the Iraqi in his worn style hat of Imam in A.D 712. He send his commander “Mohammad Ibin-Qassim to the town of Sind in India where there is an evidence of Buddhism religion, the order Qassim took from Hajaj was “bring destruction on the unbelievers, treat them harshly and cause injury to them till be submits”.
After the capture of the port of Debal, the Muslim army took three days to slaughter the inhabitants; on the conquest of Sind, there were certainly massacres in the towns of Sind when the Arabs first arrived.