He then went to the port of San Pedro, where he and John Temple carried on a trading business and general-merchandise store from 1844 till 1849.In 1851, landowner Vicente de la Osa sold Rancho Providencia to Alexander and Mellus Company.[3] His brother, George C. Alexander, and Phineas Banning operated Alexander & Banning as a successful freight and stage line,[4][5] and in 1851 they: brought in from Salt Lake ten heavy freight wagons, the first seen in this part of the country, and supplemented them later with the purchase of a whole train of 16 wagons and 168 mules from Chihuahua, at a cost of about $30,000.[Later, in February 1855, he] was known to be an experienced frontiersman, and though they had a terrible time of it—they were three days going one mile in San Francisquito Canyon, building the road as they advanced—the train reached Fort Tejon with cargo intact.[2]During the Mexican War of 1846–47, he favored the Americans and was made a prisoner by the Californios at the Rancho Santa Ana del Chino of Isaac Williams, but he was released on parole.