At the outer gate the members of the guard begged to be permitted to rescue Sublatus and avenge the insult that had been put upon him, but the Emperor warned them to permit his captor to leave the palace in safety, provided he kept his word and liberated Sublatus when they had reached the avenue beyond the gate. The scarlet-cloaked guard fell back grumbling, their eyes filled with anger because of the humiliation of their Emperor. Even though they had no love for him, yet he was the personification of the power and dignity of their government, and the scene that they witnessed filled them with mortification as the half-naked barbarian bore their commander-in-chief through the palace gates out into the tree-bordered avenue beyond, while the black interpreter marched ahead, scarce knowing whether to be more downcast by terror or elated through pride in this unwonted publicity. The city of Castra Sanguinarius had been carved from the primeval forest that clothed the west end of the canyon, and with unusual vision the founders of the city had cleared only such spaces as were necessary for avenues, buildings, and similar purposes. Ancient trees overhung the avenue before the palace and in many places their foliage over-spread the low house-tops, mingling with the foliage of the trees in inner courtyards. Midway of the broad avenue the ape-man halted and lowered Sublatus to the ground. He turned his eyes in the direction of the gateway through which the soldiers of Sublatus were crowding out into the avenue. "Tell them," said Tarzan to the interpreter, "to go back into the palace grounds; then and then only shall I release their Emperor," for Tarzan had noted the ready javelins in the hands of many of the guardsmen and guessed that the moment his body ceased to be protected by the near presence of Sublatus it would be the target and the goal of a score of the weapons. When the interpreter delivered the ape-man's ultimatum to them, the guardsmen hesitated, but Sublatus commanded them to obey, for the barbarian's heavy grip upon his shoulder convinced him that there was no hope that he might escape alive or uninjured unless he and his soldiers acceded to the creature's demand. As the last of the guardsmen passed back into the palace courtyard Tarzan released the Emperor and as Sublatus hastened quickly toward the gate, the guardsmen made a sudden sally into the avenue. They saw their quarry turn and take a few quick steps, leap high into the air and disappear amidst the foliage of an overhanging oak. A dozen javelins hurtled among the branches of the tree. The soldiers rushed forward, their eyes strained upward, but the quarry had vanished. Sublatus was close upon their heels. "Quick!" he cried. "After him! A thousand denarii to the man who brings down the barbarian." "There he goes!" cried one, pointing. "No," cried another. "I saw him there among the foliage. I saw the branches move," and he pointed in the opposite direction.