At last, in August, Manco raised the siege of Cuzco. His great force was eating up the country; and unless he set the inhabitants to their planting, famine would presently be upon him. So, sending most of the Indians to their farms, he left a large force to watch and harass the Spaniards, and himself with a strong garrison retired to one of his forts. The Spaniards now had better success in their forays for food, and could better stave off starvation; but the watchful Indians were constantly attacking them, cutting off men and small parties, and giving them no respite. Their harassment was so sleepless and so disastrous that to check it Hernando conceived the audacious plan of capturing Manco in his stronghold. Setting out with eighty of his best horsemen and a few infantry, he made a long, circuitous march with great caution, and without giving the alarm. Attacking the fortress at daybreak, he thought to take it unawares; but behind those grim walls the Indians were watching for him, and suddenly rising they showered down a perfect hail of missiles upon the Spaniards. Three times with the courage of despair the handful of soldiers pressed on to the assault, but three times the outnumbering savages drove them back. Then the Indians opened their sluice-gates above and flooded the field; and the Spaniards, reduced and bleeding, had to beat a retreat, hard pressed by the exultant foe. In this dark hour, Pizarro was suddenly betrayed by the man who, above all, should have been loyal to him,--the coarse traitor Almagro. IX. THE WORK OF TRAITORS. Almagro had penetrated Chile, suffering great hardships in crossing the mountains. Again he showed the white feather; and, discouraged by the very beginning, he turned and marched back to Peru. He seems to have concluded that it would be easier to rob his companion and benefactor than to make a conquest of his own,--especially since he learned how Pizarro was now beset. Pizarro, learning of his approach, went out to meet him. Manco fell upon the Spaniards on the way, but was repulsed after a hot fight. Despite Pizarro's manly arguments, Almagro would not give up his plans. He insisted that he should be given Cuzco, the chief city, pretending that it was south of Pizarro's territory. It was really within the limits granted Pizarro by the Crown, but that would have made no difference with him. At last a truce was made until a commission could measure and determine where Pizarro's southern boundary lay. Meantime Almagro was bound by a solemn oath to keep his hands off. But he was not a man to regard his oath or his honor; and on the dark and stormy night of April 8, 1537, he seized Cuzco, killed the guards, and made Hernando and Gonzalo Pizarro prisoners. Just then Alonso de Alvarado was coming with a force to the relief of Cuzco; but being betrayed by one of his own officers, he was captured with all his men by Almagro.