Good service in all their three capacities had been done by the Order as long as the Crusaders were able to keep a footing in the Holy Land; but they were driven back step by step, and at last, in 1291, their last stronghold at Acre was taken, after much desperate fighting, and the remnant of the Hospitaliers sailed away to the isle of Cyprus, where, after a few years, they recruited their forces, and, in 1307, captured the island of Rhodes, which had been a nest of Greek and Mahometan pirates. Here they remained, hoping for a fresh Crusade to recover the Holy Sepulcher, and in the meantime fulfilling their old mission as the protectors and nurses of the weak. All the Mediterranean Sea was infested by corsairs from the African coast and the Greek isles, and these brave knights, becoming sailors as well as all they had been before, placed their red flag with its white cross at the masthead of many a gallant vessel that guarded the peaceful traveler, hunted down the cruel pirate, and brought home his Christian slave, rescued from laboring at the oar, to the Hospital for rest and tendance. Or their treasures were used in redeeming the captives in the pirate cities. No knight of St. John might offer any ransom for himself save his sword and scarf; but for the redemption of their poor fellow Christians their wealth was ready, and many a captive was released from toiling in Algiers or Tripoli, or still worse, from rowing the pirate vessels, chained to the oar, between the decks, and was restored to health and returned to his friends, blessing the day he had been brought into the curving harbour of Rhodes, with the fine fortified town of churches and monasteries. Some eighteen years after the conquest of Rhodes, the whole island was filled with dismay by the ravages of an enormous creature, living in a morass at the foot of Mount St. Stephen, about two miles from the city of Rhodes. Tradition calls it a dragon, and whether it were a crocodile or a serpent is uncertain. There is reason to think that the monsters of early creation were slow in becoming extinct, or it is not impossible that either a crocodile or a python might have been brought over by storms or currents from Africa, and have grown to a more formidable size than usual in solitude among the marshes, while the island was changing owners. The reptile, whatever it might be, was the object of extreme dread; it devoured sheep and cattle, when they came down to the water, and even young shepherd boys were missing. And the pilgrimage to the Chapel of St. Stephen, on the hill above its lair, was especially a service of danger, for pilgrims were believed to be snapped up by the dragon before they could mount the hill.