Purchase of the _Vesta_--May 4th, 1855, sailing of the "Immortal Fifty-six"--The American Phalanx--First battle of Rivas--Punishing a desperado--Trouble in Castellon's Cabinet--Battle at Virgin Bay--Death of Castellon. Walker submitted the contract, worded with legal precision, to the civil and military authorities at San Francisco, and was gratified to learn that it in nowise threatened to violate the neutrality laws of the country. General Wool, to whom Walker had surrendered on his return from Sonora, professed himself satisfied; the district attorney of the United States found no flaw; but everybody in San Francisco knew that Walker was about to colonize Nicaragua with filibusters, and smiled at the peaceful fiction. The legal difficulties overcome, there remained the graver question of funds. To add to his embarrassments, Walker fell sick. It was late in April before he had succeeded in getting the few thousand dollars needed to charter and fit out a vessel. Meanwhile General Jerez, commanding the Democratic army at Leon, had made one or two contracts with other Americans, unknown to his superiors. The Granadinos, too, not to be behind their Democratic rivals, had sent Don Guadalupe Saenz to California to drum up recruits for their side. But nothing came of either venture, and the Leonese, now hemmed in their own department by the victorious Legitimists, looked wistfully for the coming of Walker. He at last succeeded in collecting the barely necessary amount of money, and cast about him for a suitable vessel to carry the new Argonauts.