With regard to the name of the tribal group concerned there seems to be no question. In a letter of May 30, 1805, from San Francisco to Governor Arrillaga (Bancroft Trans., Prov. St. Pap., XIX: 42) José Arguello speaks of "the rancheria of the Luechas, where the attack against Father Cuevas took place." Much later, José Maria Amador, writing for H. H. Bancroft in 1877 (Bancroft Manuscript, Amador, Memorias, translated by Earl R. Hewitt), referred to "Cuevas, who was going to instruct in the Christian faith the heathen at the Lochis rancheria...." Here is a discrepancy, for the contemporary documents state that Father Cuevas intended to exercise his religious functions at the rancheria of the Asirenes. However, it is clear enough that the outrage itself was perpetrated by the Luechas. The location of the people--wholly apart from the question of where the attack occurred--is equivocal. That the attack took place in the Sierra is beyond doubt, but that the home of the offenders was likewise in the hills is not so sure. Cutter (1950, p. 92) relies upon a statement of Amador (below) when he states: "The Indians had turned out to be the Luechas, residents of the hills between Livermore and the San Joaquin Valley"; and "this would place them at the foothills east of Mount Diablo at the entrance of the Valley." The pertinent sentence in Amador's Memorias (MS, p. 13) reads thus: "rancheria de Loechas, como 14 leguas al oriente de la mision, arriba del actual pueblo de Livermore a 4 o 5 leguas de dist^{a}." Allowing, conservatively, 2.5 miles per league, the total distance from the mission, if Amador is correct, would be 35 miles. The rancheria would be from 10 to 12.5 miles from Livermore. The term "above" ("arriba de....") does not necessarily mean toward the geographical north, but the direction may be taken as in the quadrant from north to east. The arc of the circumference of a circle with center at Livermore and radius of 12 miles passes approximately from San Ramon in the northwest, well south of Mount Diablo, across the very rough lower spurs of the mountain massif to the mouth of Kellogg Creek near Byron to the northeast. From here it runs along beyond Altamont, close to Mountain House and Midway, as far as upper Corral Hollow to the southeast. This entire stretch is devoid of any indication of substantial aboriginal occupancy, either in the eighteenth-century documents or in modern archaeological research. Let us also note Amador's total: 14 leagues east of the Mission, or fully 35 miles. The horseback trail of 1805 followed pretty much the shortest highways of today: from Mission San José to Sunol and thence to Livermore via Pleasanton or directly across the low hills east of Sunol. By the first route the distance is 18 miles, by the second 16 miles. Using the larger value, 18 miles, the rancheria would have been not 12, but 17 miles beyond Livermore, which would have put it definitely in, or on the edge of, the San Joaquin Valley.