When the Arabs first issued from the desert, they must have been surprised at the ease and rapidity of their own success. But when they advanced in the career of victory to the banks of the Indus and the summit of the Pyrenees; when they had repeatedly tried the edge of their cimeters and the energy of their faith, they might be equally astonished that any nation could resist their invincible arms; that any boundary should confine the dominion of the successor of the prophet.