The Arab invasions of 7th century into neighboring countries left an irreparable damage and shattered the fabrics of many societies, but the bitter truth remained silent. The wars they fought were mainly political. They were not sincere in their ideology. After each invasion, they took millions of young females as slaves, irrefutable.
Of course, nobody expects fighting men of this nature to be nice to the so-called infidel women, Christians, Jews etc. To them a woman was/ is nothing but a sex tool. These victims ranged from royal families to commoners, even including Moslems. The women were chained and passed to ranks and files, or sold in the market places as a source of revenue, again irrefutable.
After each battle, females were herded around, first, to watch the beheading of their men, father or husband, and then to be taken away to be sexually used by men whose hands were still wet with fresh blood.
Since the available history books were written for the victors, we find no trace of the abducted females. However, if we consider only two females for each man, millions, one can guess the staggering figures.
A quick review of the events, say around 600-700 AD, reveals that the Arab commanders acted on their own. Their only responsibility was delivery of the booties. One registered instance is as follows: It was carried out by an Arab general called Khalid ibn Walid (592-642), his tomb in Homs, Syria. He was victorious in over a hundred battles. He brought down Byzantine-Roman Empire, Sassanid-Persian Empire etc. He was called the 'Drawn Sword of Allah'. He initially opposed prophet of Islam but later, 628 AD, i. e. at the age of 36 and five years before the death of the prophet turned Moslem.
Anyway, immediately after the death of the prophet, several Arab tribes gave up Islam, known as Ridda-the penalty for which was determined to be death, i. e. once a Moslem, always a Moslem. It was called Wars of Ridda or Wars of Apostasy. Khalid was sent, by 1st Caliph, to crush the revolt. Among these prominent figures, there was a Moslem called Malik and his wife, Layla. Laya was very pretty. Khalid set up a summary court-martial, beheaded Malik and immediately took his beautiful wife, a Moslem, too, to his camp tent-an act disallowed according to Islam.
Khlid is quoted to have said he fought many battles, while wishing martyrdom, which did not happen. He did not like to die on his bed like' an old camel'. The reason is that a Moslem warrior killed in action goes straight to the promised paradise, not waiting until the doomsday. Khalid's behavior shows that he did not obey his superior, but he strongly believed in martyrdom and was in a hurry to meet the unseen allocated females, awaiting him. Laylas did not quench his everlasting desire for women. He needed numerous females of better description.