The Moors paid dearly for their daring assault. The Christians retaliated by an attack on the strong and rich city of Alhama, a stronghold within the centre of the kingdom, only a few leagues distant from the capital itself. Strongly situated on a rocky height, with a river nearly surrounding it and a fortress seated on a steep crag above it, and far within the border, no dream of danger to Alhama came to the mind of the Moors, who contented themselves with a small garrison and a negligent guard. But the loss of Zahara had exasperated Ferdinand. His wars at home were over and he had time to attend to the Moors, and scouts had brought word of the careless security of the guard of Alhama. It could be reached by a difficult and little-travelled route through the defiles of the mountains, and there were possibilities that a secret and rapid march might lead to its surprise. At the head of the enterprise was Don Rodrigo Ponce de Leon, Marquis of Cadiz, the most distinguished champion in the war that followed. With a select force of three thousand light cavalry and four thousand infantry, adherents of several nobles who attended the expedition, the mountains were traversed with the greatest secrecy and celerity, the marches being made mainly by night and the troops remaining quiet and concealed during the day. No fires were made and no noise was permitted, and midnight of the third day found the invaders in a small, deep valley not far from the fated town. Only now were the troops told what was in view. They had supposed that they were on an ordinary foray. The inspiring tidings filled them with ardor, and they demanded to be led at once to the assault. Two hours before daybreak the army was placed in ambush close to Alhama, and a body of three hundred picked men set out on the difficult task of scaling the walls of the castle and surprising its garrison. The ascent was steep and very difficult, but they were guided by one who had carefully studied the situation on a previous secret visit and knew what paths to take. Following him they reached the foot of the castle walls without discovery. Here, under the dark shadow of the towers, they halted and listened. There was not a sound to be heard, not a light to be seen; sleep seemed to brood over castle and town. The ladders were placed and the men noiselessly ascended, Ortega, the guide, going first. The parapet reached, they moved stealthily along its summit until they came upon a sleepy sentinel. Seizing him by the throat, Ortega flourished a dagger before his eyes and bade him point the way to the guard-room. The frightened Moor obeyed, and a dagger thrust ended all danger of his giving an alarm. In a minute more the small scaling party was in the guard-room, massacring the sleeping garrison, while the remainder of the three hundred were rapidly ascending to the battlements.