[1] The grant extended along both banks of Putah Creek (formerly Rio Los Putos) and encompassed present day Winters.John spent ten years in New Mexico, then joined his brother William in Southern California in 1838.In 1842, Governor Alvarado granted the four square league Rancho Rio de los Putos to William Wolfskill, a Mexican citizen.Brother John set out a short time later with cattle, oxen, a few horses and a satchel of cuttings and seeds to settle on his dream land, and arrived at Putah Creek in mid-July 1842—the first American settler in Solano County.With the cession of California to the United States following the Mexican–American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.