Soon after the departure of the friars, Cortes sent out his last expedition. It was commanded by Francisco de Ulloa, and consisted of three vessels, well equipped. Sailing from Acapulco, on the 8th of July 1539, Ulloa reached the Bay of Santa Cruz, after losing one of his vessels in a storm. From Santa Cruz he started to survey the coast towards the north-west. He completely examined both shores of the Gulf of California, and discovered the fact of the connection of the peninsula with the main land, near the 32° of latitude. This gulf Ulloa named the Sea of Cortes. On the 18th of October, he returned to Santa Cruz, and on the 29th again sailed with the object of exploring the coasts farther west. He rounded the point now called Cape San Lucas, the southern extremity of California, and sailed along the coast towards the north. The Spaniards proceeded slowly, as they were opposed by north-western storms, and often landed and fought with the natives. In January, 1540, Ulloa reached the island under the 28th parallel of latitude, near the coast, which they named the Isle of Cedars. There he remained till April, when one of the ships, bearing the sick and accounts of the discoveries, was sent back to Mexico. The returning vessel was seized at Santiago by the officers of the viceroy. The fate of the remaining vessel is uncertain. Some of the writers of that day asserting that he continued his voyage as far north as the 30° of latitude, and returned safely to Mexico; while one asserts that nothing more was heard of him after the return of the vessel he sent back. In the mean time, the two friars and the Moor penetrated a considerable distance into the interior of the continent, and sent home glowing accounts of rich and delightful countries which they said they had discovered. The inhabitants had, at first, been hostile, and had killed the Moor; but in the end submitted to the authority of the King of Spain. Mendoza, believing the accounts of the friars to be strictly true, prepared an expedition for the conquest of the countries they described. Disputes with the different Spanish chieftains occupied some months, at the end of which Cortes returned to Spain, in disgust. Mendoza despatched two bodies of troops, one by land, the other by sea, to reconnoitre the newly discovered land, and clear the way for conquest. The marine expedition was undertaken by two ships, under the command of Fernando de Alarcon, who sailed from Santiago on the 9th of May, 1540, and proceeding north-west along the coast, he reached the head of the California Gulf, in August of the same year. There he discovered the river now called the Colorado. The stream was ascended to the distance of eighty leagues, by Alarcon and some of his men, in boats; but all their inquiries were unsatisfactorily answered, and it was determined to return to Mexico. The vessels returned safely before the end of the year.