Since no specific information is given, it may be assumed that this expedition penetrated the area lying between Mt. Diablo and the Livermore Valley, perhaps getting as far north as Walnut Creek. It is stated and implied that the Sacalanes were in a condition of great disorganization. They had been driven into the hills, apparently widely scattered and probably seriously depleted in numbers. LUÍS PERALTA'S EXPEDITIONS The last information we possess concerning this group of natives comes from the year 1804. In 1803, a letter, dated May 11 at Loreto, from Governor Arrillaga to the Viceroy (Archivo General de la Nación, Ramo Californias, Vol. 9, MS p. 433) mentions the fact that 20 Christians, sent out by the missionaries of Santa Clara, were attacked and routed by Gentiles who killed their "principal." In connection with this murder, and with a supposed plot to destroy Mission San José, the testimony of witnesses was taken a year later (Archivo General de la Nación, Ramo Californias, Vol. 9, MS pp. 437-439, June 21, 1804, San José, Luís Peralta in charge). On September 27, 1804, from Santa Clara, in a letter to an unnamed captain, Luís Peralta (Bancroft Trans., Prov. St. Pap., XVIII: 334) advised that the expedition he made against Gentile Indians had no satisfactory results, because of lack of guides. On September 29, Arguello, at San Francisco, wrote to Governor Arrillaga (Bancroft Trans., Prov. St. Pap., XVII: 354) that he had ordered Peralta to go to the "Sierra de San José" in pursuit of Gentile assassins of Christians, but Peralta could not catch them. Peralta went out a second time. Arguello, from San Francisco, on October 26, wrote again to Governor Arrillaga (Bancroft Trans., Prov. St. Pap., XVII, 358-359) that Peralta could not catch the killers of the Mission Indian Jorge, but he did catch 11 Christians, and after leaving the women and children at the mission, brought 32 "gandules" ("rogues," "rascals," a colloquial term for renegade Indians) to the Presidio. Since the "Sierra de San José" was the coast range behind the East Bay it is clear that the remnant of the people who originally inhabited the interior had taken to the hills in a last stand against the invader. After 1804 all mention of them ceases. _The Cuevas Affair._--In 1805 occurred what is called the "Cuevas Affair." This event has significance for the Alameda and Contra Costa natives, rather than those of the delta or lower San Joaquin Valley, only if the Indians concerned were bona fide aboriginal inhabitants of the inner coast ranges, as Cutter (1950) seems to assume. We must therefore review the evidence.