Meanwhile Commodore Shubrick, in command of the expedition, had completed his preparations for ascending the Parana, and the fleet soon moved up to a convenient point, the Commodore himself continuing on up the river in a small vessel to Corrientes to meet Lopez and convey to him the ultimatum of the United States. After some "backing and filling," as an old salt would characterize diplomacy, Lopez concluded "discretion to be the better part of valor," and making a satisfactory _amende_, the Paraguayan war came to a bloodless end, and the hopes of expectant heroes with visions of promotion dissolved like summer clouds. Young Perkins was now, August, 1858, transferred to the frigate Sabine for passage home to his examination for the grade of passed midshipman. Passing that ordeal satisfactorily, aided by handsome commendatory letters from his commanding officers, he spent three happy months at home, and then received orders for duty on board the steamer Sumter, as acting master, the destination of that vessel being the west coast of Africa, where, in accordance with the provisions of Article 8 of the Webster-Ashburton treaty (1842), the United States maintained a squadron, carrying not less than eighty guns, in co-operation with the British government, for the suppression of the slave trade. That article continued in active observance nineteen years, when the United States, having a little question of slavery to settle at home, gave the stipulated preliminary notice and recalled the ships. The Sumter arrived on the coast in October, 1859, making her first anchorage in the lovely harbor on the west side of Prince's Island. That island, in about 1° 30' north latitude, covered with all the luxuriance of tropical growth and verdure, and broken into every conceivable shape of pinnacle, castellated rock and chasm, and frowning precipice, streaked with silvery threads of leaping streams in their dash to the sea, is indeed one of the most enchanting spots the eye ever rested on. The chief inhabitant of the lovely isle was Madame Ferrara, a woman of French extraction, who lived alone in a big, rambling house, surrounded by slaves, who cultivated her plantations and prepared the cocoa, palm oil, yams, and cocoanuts, for the trade that sought her doors. Filling up with water, the Sumter proceeded to the island of Fernando Po, a Spanish possession close in to the mainland, in the Bight of Biafra, where she met several English and French men-of-war, and received orders for her future movements.