Notwithstanding the establishment of peaceful relations, a desultory warfare was still carried on in Lazica. A twelve-month's experience of Persian domination convinced the Lazi that there was something even worse than Byzantine extortion, and they prayed to be received again into the fold of a nation which was at least Christian like themselves. Nor could the Romans endure the loss of Petra, but sent an expeditionary force into the country to retake it. They were opposed by a Persian army, and for many years the principality was the scene of numerous petty successes and defeats. Chosroes imported a large quantity of material for the purpose of building a fleet on the Euxine, but it was suddenly consumed by lightning, whence it happened that the command of the sea in these regions was never obtained by the Persians.
Intermittently the siege of Petra was pressed for eight years before the stronghold again came into the hands of the Byzantines (551). The successful general was Bessas, who, though above seventy years of age, was the first to ascend the scaling ladders at the last assault. The defence of the fortress had been persisted in by the Persians with extraordinary fortitude; and out of seven hundred and thirty men of the garrison, who were taken prisoners, it was found that only eighteen had not received a wound. Five hundred of the survivors took refuge in the citadel, and in spite of an earnest exhortation by Bessas, preferred death by fire to surrender; whence all of these perished in the flames with which the Romans consumed the buildings. The fortress contained a store of provisions calculated to last for five years, and the reserve of arms and armour would have sufficed to fit out each man of the garrison five times over. But the captors were chiefly amazed at seeing a copious flow issuing
