I shall permit you to depart, each with an under-garment and a shirt; and, at my entreaty, my friend Sarbar will not refuse a passage through his lines. Your absent prince, even now a captive or a fugitive, has left Constantinople to its fate; nor can you escape the arms of the Avars and Persians, unless you could soar into the air like birds, unless like fishes you could dive into the waves." During ten successive days, the capital was assaulted by the Avars, who had made some progress in the science of attack; they advanced to sap or batter the wall, under the cover of the impenetrable tortoise; their engines discharged a perpetual volley of stones and darts; and twelve lofty towers of wood exalted the combatants to the height of the neighboring ramparts. But the senate and people were animated by the spirit of Heraclius, who had detached to their relief a body of twelve thousand cuirassiers; the powers of fire and mechanics were used with superior art and success in the defence of Constantinople; and the galleys, with two and three ranks of oars, commanded the Bosphorus, and rendered the Persians the idle spectators of the defeat of their allies. The Avars were repulsed; a fleet of Sclavonian canoes was destroyed in the harbor; the vassals of the chagan threatened to desert, his provisions were exhausted, and after burning his engines, he gave the signal of a slow and formidable retreat. The devotion of the Romans ascribed this signal deliverance to the Virgin Mary; but the mother of Christ would surely have condemned their inhuman murder of the Persian envoys, who were entitled to the rights of humanity, if they were not protected by the laws of nations. After the division of his army, Heraclius prudently retired to the banks of the Phasis, from whence he maintained a defensive war against the fifty thousand gold spears of Persia. His anxiety was relieved by the