At war's end, Mexico was forced to sell the territories of Alta California and New Mexico to the United States under The Treaty of Guadalupe Hidalgo.one of carson's best known adventures took place during this war.In December 1846, Carson was ordered by General Stephen W. Kearny to guide him and his troops from Socorro, New Mexico to San Diego, California. Mexicans soldiers attacked Kearny and his men near the village of San Pasqual, California.Kearny was outnumbered. He knew he could not win; he ordered his men to take cover on a small hill. On the night of December 8, Carson, a naval lieutenant named Beale, and an Indian scout left Kearny to bring reinforcements from San Diego, 25 miles away. Carson and the lieutenant removed their shoes because they made too much noise, and walked barefoot through the desert.By December 10, Kearny believed reinforcements would not arrive. He planned to break through the Mexican lines the next morning, but 200 mounted American soldiers arrived in San Pasqual late that night. They swept the area, driving the Mexicans