For one of my projects on linen armour, I had to quickly check a reference to the memoirs of Usāmah Ibn-Munqidh, a garrulous old pirate with lots of tall tales about fighting and hunting and the barbarous customs of the Franks. As I was flipping through it, I discovered another story which I want to share.
The Ismāˁīlites … attacked the Castle of Shayzar (in 1109 or 1114 CE) … On that day I had an encounter with an Ismāˁīlite, who had a dagger in his hand, while I had my sword. He rushed on me with a dagger, and I hit him in the middle of his forearm as he was grasping the handle of the dagger in his hand and holding the blade close to his forearm. My blow cut off about four inches of the blade and cut his forearm in two in the middle. The mark of the edge of the dagger was left on the edge of my sword. An artisan in our town, seeing it, said, “I can remove this dent from it.” But I said, “Leave it as it is. This is the best thing in my sword.” The trace is there to the present day. Whenever one sees it he knows it is the trace of a knife.
– Philip K. Hitti, An Arab-Syrian Gentleman and Warrior in the Period of the Crusades: Memoirs of Usāmah Ibn-Munqidh (Columbia University Press: New York, 1929) pp. 146, 147 https://archive.org/details/AnArab-SyrianGentlemanAndWarriorInThePeriodOfTheCrusadesMemoirsOfUsamaIbn-Munqidh-PhilipK.Hitti/page/n155/
Foreigners who are not up on the details of Islamic theology call the Ismāˁīlites the Assassins after the hashish which they were said to consume. Shaizar is at a ford of the Orontes River in Syria.