Charles Mackay, Memoirs of Extraordinary Popular Delusions…
“ The Saracens upon the ramparts beheld all these manifestations without alarm. To incense the Christians, whom they despised, they constructed rude crosses, and fixed them upon the walls, and spat upon and pelted them with dirt and stones. This insult to the symbol of their faith raised the wrath of the crusaders to that height that bravery became ferocity and enthusiasm madness. When all the engines of war were completed the attack was recommenced, and every soldier of the Christian army fought with a vigour which the sense of private wrong invariably inspires. ”
