Various places, I googled for something or other. And sorry, it was the Seventh Crusade, not the Fifth. This one has the story: http://www.mysticsaint.info/2009/01/...orison-of.html (There is a music player on the right column, which you can turn off) "The Hizb an-Nasr was inspired and recited by Shaykh Abu Hassan As-Shadhuli about 800 years ago. This Hizb is called as-Saif as-shadhili (The sword of shadhili). It was written at the time when Shaykh Abu Hassan was fighting against the Crusaders, led by King Louis IX of France. The invading Crusaders were trying to invade through the city of Mansura. Towards the end of his life, Abul Hasan Shadhili’s eye sight started to become weaker. He was slowly losing his eye sight but it didn’t prevent him from fighting in the front line of the battle of al-Mansurah when the Crusaders forces under King Louis of France invaded Misr (Egypt) in 1250. His age was approximately 54 then. ... On the day of the battle he (Shaykh Abul Hasan) mounted his best horse and had one of the muridun hand him up his sword. When he had his sword to hand he asked for another, and with a sword in his right hand and a sword in his left hand he rode into battle. When asked later, given his deteriorating eyesight, how he could have ridden into battle and so honourably acquitted himself on the battle field he simply pointed to his heart saying: “If the eye of the heart sees clearly what need is there for my eyes?” "