The veteran Castilla, as soon as the 'Apurimac' had sailed for the Chincha Islands, formed the daring plan of attacking his enemy in the north; and, in spite of the Navy, which had declared against him, he bought an old steamer, the 'Santiago,' belonging to the English Steam Navigation Company, and boldly steamed away in search of the Regenerator. On hearing of his approach, Vivanco was seized with a panic, and, evacuating the places he had occupied, retreated to his ships. He now thought that, in the absence of Castilla, he might succeed in an attempt on the capital, and, collecting all his vessels, he retraced his steps southward, and arrived in Callao bay on April 22nd, 1857. A night attack was then made on the fort, but, after some hard street fighting, Vivanco's party were obliged to retire to their ships; and, his expedition having proved a complete failure, the Regenerator returned to Islay, and proceeded at once to Arequipa. While Vivanco was absent in the north, General San Roman had collected a considerable force in the interior, with which he marched towards Arequipa. The warlike Cholos came out to meet him, and a skirmish followed, which they call the battle of Yumina. It consisted of a considerable waste of powder, the two parties firing at each other, at very long ranges, across a ravine; and in the afternoon the Cholos returned in triumph to Arequipa. Having missed Vivanco in the north, old Don Ramon Castilla steamed away to Arica in the same old 'Santiago,' safely passing the rebellious fleet at Islay, collected a force at Tacna, and, marching by land, arrived in the campiña of Arequipa in the end of July; soon afterwards establishing his head-quarters at the village of Sachaca, some miles below the city, on the banks of the river Chile. A detachment occupied Tiavaya, to cut off Vivanco's communication with Islay. The people of Arequipa were now hard at work to place the city in a proper state of defence; barricades were erected in the most important streets, and day and night the Cholos were under arms. But, supplies having now entirely ceased from the custom-house at Islay, Vivanco found himself in great difficulties; for people, having little faith in the success of his revolution, were unwilling to advance money in exchange for his _vales_ or promissory notes, even at a discount of fifty per cent. The needy Regenerator then resorted to more violent methods of raising money, and, breaking open several of the principal shops, began to sell their contents to the highest bidder.