Cromwell's disappointment and chagrin over the failure of his great enterprise were extreme. Both the returned commanders were forthwith sent to the Tower, and though presently released, remained throughout the whole of the Protectorate in disgrace. Still Jamaica had been won and must be held. The command after Venables' departure had devolved on Richard Fortescue, a colonel of the New Model, who, without concealing his infinite contempt for those who had gone home, set himself cheerfully to turn the new possession to account. To him Cromwell wrote letters of encouragement and thanks, with promise of speedy reinforcement. But now a new enemy appeared in Jamaica, one that has laid low many tens of thousands of red-coats, the yellow fever. In October 1655 the first reinforcements arrived, under command of Major Sedgwicke. He had hardly set foot on the island before Fortescue succumbed, and he could only report that the army was sadly thinned and that hardly a man of the survivors was fit for duty. Then the recruits began to fall down fast, and in a few days the men were dying at the rate of twenty a day. Sedgwicke was completely unnerved; he gave himself up for lost, and in nine months followed Fortescue to the grave. Fresh reinforcements, including all the vagabondage of Scotland, were hurried across the Atlantic to meet the same fate. Colonel Brayne, who had served with Monk in Scotland, arrived to succeed Sedgwicke in December 1656. He lasted ten months, surviving even so two thirds of the men that he brought with him, and then went the way of Sedgwicke and Fortescue. Finally a Colonel D'Oyley, who had sailed with the original expedition, took over the command, and being a healthy, energetic man, soon reduced things to such order that when in May 1658 the Spaniards attempted to recapture the island, he met and repulsed them with brilliant success. Thus at length was firmly established the English possession of Jamaica.