During the
Mexican–American War (1846–1848), Murphy fought under
Manuel Micheltorena. He served as a
private in Company G, and later as a
sergeant in Company H in the
California Battalion, a volunteer company, under
John C. Frémont in 1846. After the war Daniel and his older brother
John Marion Murphy earned a living as merchants, but like many others, they began prospecting when the
California Gold Rush began. Their brother-in-law
Carl David Maria Weber (married to sister Helen), had formed the
Stockton Mining Company in
Placerville, California (formerly known as Hangtown). at what they called "Murphys Old Diggings," later known as "Murphys New Diggings," "Murphy's Camp," and eventually by 1835 it was just "
Murphys". The Murphy brothers made far more money as merchants than as miners. Daniel Murphy was a member of the Carson Creek Consolidated Co. (or Morgan Mine). In January 1851, Daniel Murphy married Maria Fisher Ceseña (also written as Mary Fisher, and later Mary Fisher Murphy–Colombet). Murphy later purchased a cattle ranch in Durango, Mexico; which in turn made him the one of the wealthiest property owners in the United States. Additionally he owned tracts of land in
Tulare County, California and in Arizona. == Late life, death, and legacy ==