Their Horses Climbed Trees tells the little known story of the five hundred volunteers from California known as the "California Hundred and Battalion", who fought in the East during the Civil War years 1863-1865, as a part of the Second Massachusetts Volunteer Cavalry Regiment. They served from 1862, when they departed from San Francisco, to the war's end at Appomattox in 1865. The unit interacted primarily against Colonel John Mosby. In the latter...