High Quality Content by WIKIPEDIA articles! The 1st Oregon Volunteer Infantry Regiment was an American Civil War era military regiment recruited in Oregon for the Union Army. The regiment was formed in November 1864. At full strength, it was composed of ten companies of foot soldiers. The regiment was used to guard trade routes and escorted immigrant wagon trains from Fort Boise to the Willamette Valley. Its troops were used to pursue and suppress Indian raiders in eastern Oregon and the Idaho Territory. Several detachments accompanied survey parties and built roads in central and southern Oregon. The regiment`s last company was mustered out of service on July 1867.