References:
Dyer's Compendium of the War of the Rebellion, 1908 Edition

1st REGIMENT CAVALRY.

Organized at large in Oregon February to April, 1862. Regiment concentrated in Williamette Valley and ordered May, 1862, to Walla Walla Country and Mining Districts of Nez Perce and Salmon River Countries to protect emigrants and miners. Headquarters at Fort Walla Walla, Washington Territory.

Company "A" moved from near Oregon City to Fort Dallas; thence to Fort Walla Walls, Washington Territory, June 24-July 12, 1862. Left Fort Walla Walls July 25, 1862, for Salmon Falls on Snake River Expedition against Snake Indians in Idaho August 19-October 11, 1862, and protecting emigrant roads till November. At Fort Dalles till April, 1863. Ordered to Fort Walla Walla April 20. Expedition against Snake Indians in Idaho May 4-October 26, 1863. Expedition from Fort Walla Walla to Snake River, Washington Territory, February 16-23, 1864, and to Southeastern Oregon April 30-October 6, 1864. Expedition from Fort Boles to Salmon Falls, Idaho Territory, and skirmishes August 27-October 5, 1864. At Fort Vancouver and other stations in Oregon and Idaho till muster out. Expedition from Camp Lyon, Idaho Territory, to Malheur River, Ore., and skirmish July 2-13, 1865.

Company "B" moved from Salem, Ore., to Fort Vancouver; thence to Fort Walls Walla via Fort Dalles May 14-June 2, 1862. Left Fort Walla Walla July 25. 1862, for Salmon Falls on Snake River. Expedition against Snake Indians in Idaho August 19-October 11, 1862, and protect emigrant roads till November 1, 1862. At Fort Walla Walla till April, 1863. Moved to Fort Lapwai June 13, 1863; thence to Canyon City July 10. Ordered to Fort Vancouver September 29, 1863, and duty there till April. 1864. Expedition to Southeastern Oregon and skirmishes April 20-October 6, 1864. Duty at Forts Vancouver, Walls Walla, Boies and other points in District of Oregon till muster out. Expedition from Camp Lyon, Idaho Territory, to Malheur River, Ore., and skirmish July 2-13, 1865.

Company "C" moved from near Oregon City to Fort Vancouver June 24, 1862. (A Detachment ordered to Jacksonville, Ore., July 2, 1862.) Duty there and at Klamath operating against Indians in Rogue River District till June, 1865. At Fort Steilacoom and other points in District of Oregon till muster out.

Company "D" moved from near Oregon City to Fort Dalles; thence to Fort Walls Walla June 24-July 12, 1862. Left Fort Walla Walla July 25 for Salmon Falls on Snake River. Expedition against Snake Indians in Idaho and protecting emigrant roads August 19 to October 11, 1862. At Fort Walla Walla November, 1862, to April, 1863. Expedition from Fort Walla Walls against Snake Indians in Idaho May 4-October 20, 1863. Ordered to Fort Dalles October 29, and duty there till April, 1864. Expedition to Southeastern Oregon and skirmishes April 20-October 6, 1864. Ordered to Fort Vancouver October 6, 1864. Duty at Fort Vancouver, Fort Walla Walls and other points in the District of Oregon till muster out. Expedition from Camp Lyon, Idaho Territory, to Malheur River, Ore., and skirmish July 2-13, 1865.

Company "E" moved from Salem to Fort Vancouver; thence to Fort Walla Walla via Fort Dalles May 14-June 3, 1862. Duty at Fort Walls Walla till April, 1863. Expedition to Grand Ronde Prairie August 10-22, 1862. Expedition against Snake Indians in Idaho May 4-October 20, 1863. At Fort Walls Walla till April, 1864. Expedition from Fort Walls Walls to Snake PAver, Washington Territory, February 16-23, 1864. Expedition from Fort Walla Walla to Southeastern Oregon and skirmishes April 20-October 6, 1864. At Forts Dalles, Colville and other points in District of Oregon till muster out.

Company "F" moved from near Oregon City to Fort Dalles; thence to Fort Walla Walla June 24-July 12, 1862. Duty near Lewiston, Nez Perce Reservation, July 25 to November 1, 1862. Garrison at Fort Lapwai till May, 1865. Expedition from Fort Lapwai to the Meadows August 22 to September 20, 1863. At Fort Walla Walla and other points in District of Oregon May, 1865, to muster out.

Companies "G," "H," "I," "K," "L" and "M" authorized January, 1863. Companies "G" and "H" at Camp Watson on Rock Creek, Ore.; Company "I" st Fort Klamath, Company "K" at Fort Dalles and Companies "L" and "M" at Fort Boles. Expedition from Camp Lincoln, near Canyon City, to Harney Lake Valley March 24-April 16, 1864 (Detachment). Skirmish, Harney Lake Valley April 7 (Detachment). Expedition from Siletz Block House to Coos Bay, Crooked River, April 21-May 12, 1864 (Co. "D"). Skirmish, Crooked River May 18 (Detachment). Skirmish near Fort Klamath June 24, 1864 (Detachment). Expedition from Fort Boles to Booneville July 20-August 17, 1864 (Detachment). Expedition from Fort Boles to Salmon Falls, Idaho, August 27-October 5, 1864 (Detachment). Skirmish, Harney Lake Valley September 23, 1864 (Cos. "F" and "H"). Operations on Canyon City Road January 1 to November 30. Skirmish on Owyhee River July 17, 1865 (Detachment). Regiment mustered out November 20, 1866.