Ibn al-Athir:On The Tatars
>For some years I continued averse from mentioning this event, deeming it so horrible that I shrank from recording it and ever withdrawing one foot as I advanced the other. To whom, indeed, can it be easy to write the announcement of the death-blow of Islam and the Muslims, or who is he on whom the remembrance thereof can weigh lightly? O would that my mother had not born me or that I had died and become a forgotten thing ere this befell! Yet, withal a number of my friends urged me to set it down in writing, and I hesitated long, but at last came to the conclusion that to omit this matter could serve no useful purpose.
>I say, therefore, that this thing involves the description of the greatest catastrophe and the most dire calamity (of the like of which days and nights are innocent) which befell all men generally, and the Muslims in particular; so that, should one say that the world, since God Almighty created Adam until now, has not been afflicted with the like thereof, he would but speak the truth. For indeed history does not contain anything which approaches or comes near unto it. For of the most grievous calamities recorded was what Nebuchadnezzar inflicted on the children of Israel by his slaughter of them and his destruction of Jerusalem; and what was Jerusalem in comparison to the countries which these accursed miscreants destroyed, each city of which was double the size of Jerusalem? Or what were the children of Israel compared to those whom these slew? For verily those whom they massacred in a single city exceeded all the children of Israel. Nay, it is unlikely that mankind will see the like of this calamity, until the world comes to an end and perishes, except the final outbreak of Gog and Magog.