Another documentary source is of interest in this connection. This is the account by José Berreyesa in 1830 (MS) of an affray along the lower Sacramento River in which Americans participated under Ewing Young. Christian fugitives from the missions had been protected by the Yunisumenes (Junisumne), who had joined with the Ochejamnes. They were opposed by the Mexicans and their allies, the Sigousamenes (Siakumne), the Cosomes, and the Ilamenes. These last tribes had gathered an army of 450 "Gentiles auciliares." The Yunisumenes, Cosomes, and Ilamenes are, of course, precisely the three subtribes discussed in the preceding paragraph. Now if the Sigousamenes, Cosomes, and Ilamenes contributed 450 men collectively, they each may be considered to have furnished 150 men. Since the opponents were fairly well matched, it is likely that the Yunisumenes supplied a similar number. We can assume that for routine fighting of this sort, particularly where two of the tribelets were ranged with the Mexicans instead of against them, the armies included no more than the strictly military population, or not in excess of half the males over the age of ten years. Hence, if the sex ratio was unity and the young children constituted approximately 15 per cent of the population, the aggregate number of the three subtribes would have amounted to 1,920, or almost the same as was estimated from the Soto report in 1813 for the Lelamne (Ilamenes) above, or perhaps the Lelamne augmented by some of the Cosumnes tribelets or subtribes. The Berreyesa episode occurred in 1830, after all these groups had suffered twenty years of attrition owing to perpetual minor warfare, disease, and starvation. Hence the population of the three tribelets jointly, Junisumne, Cosumnes, and Lelamne, must have reached fully 3,000 in 1813. The baptism factor, consequently, would not have been 50 per cent, but 575 divided by 3,000, or 19.2 per cent. Three other villages or tribelets which can be identified in the mission records as being closely associated with the Cosumnes are the Amuchamne, Sololumne, and Locolumne. The first two probably correspond to Merriam's Oo-moo-chah and So-lo-lo, which in later times at least were rancherias. Assuming all three to have been villages, we may consider that each contained an average number of 300 inhabitants. The respective baptism numbers were 13.6, and 52. In relative terms the baptisms amounted to 4.3, 2.0, and 17.3 per cent.