In the month of November, 1730, Périer started on a crusade against his foes. The force which he ultimately brought together for this expedition is said to have been a thousand men, of whom seven hundred were French. In January, 1731,[66] he succeeded in running down the Natchez in their fort, situated a short distance from the river on the west side, where he besieged and finally captured—according to his own account—four hundred and fifty women and children and forty-five men. Again the greater part of the warriors of the tribe escaped him. The captives were sent to Santo Domingo, where they were sold as slaves. The resources of the colony were now better understood. Buffalo-wool, pearls, and mines were no longer relied upon. Prosperity had eluded the grasp of the greater part of the settlers; but if agricultural experiments had not proved remunerative as they had been handled, they had at least demonstrated the fertility of the soil. The hopes of commercial success, with so scant a population and under the restrictions of the monopoly, were shown to be delusive. The climate had proved a severe trial to the health of the settlers.[67] Perhaps the character of the immigrants, their improvident habits, and their reckless exposure had much to do with it, and had made the test an unfair one. At all events the experience of the Company was but a repetition of that of Crozat; and in 1731 the rights granted in the charter were surrendered to the King. During Périer’s administration a change was made in the character of the girls sent over to the colony. In 1728 there arrived a ship bearing a considerable number of young girls who had not been taken from the houses of correction. They were cared for by the Ursulines until they were married. It is not easy to follow the growth of the colony. When Crozat turned matters over to the Company, there were said to be seven hundred inhabitants; but four years afterward the Company officials, in one of their reports, put this number at four hundred. The official estimate in 1721 was five thousand four hundred and twenty, of whom six hundred were negroes. La Harpe, in his memorial, puts the population in 1724 at five thousand whites and three thousand blacks. At the time of the retrocession to the King the white population was estimated at five thousand, and the negroes at over two thousand. The treasury notes of the Company at that time constituted the circulating medium of the colony. Fifteen days were allowed, during which their use could be continued. After that their circulation was prohibited, with appropriate penalties.