sentences:  A US Army installation, Fort Union, was built in 1851 in Mora Valley.It encroached on 8 square miles of private lands of the Mora Grant for its entire span of operation, without permission of or compensation to the local land owners.This led to a protracted legal controversy, reaching all the way to the General Land Office, the Secretary of War, and the US Congress; Nevertheless, the nearby fort and its garrison provided a stable source of income to local farmers, and several grist mills were founded in Mora, including a successful one opened in 1855 by regional trader and Taos Revolt US volunteer cavalry veteran Ceran St. Vrain.