Camp Lapwai was established by Company E, 1st Regiment Washington Territory Volunteer Infantry

1st Regiment Washington Territory Volunteer Infantry

The 1st Regiment of Washington Territory Volunteer Infantry was a unit of infantry raised by the Washington Territory for service in the Union Army during the American Civil War.- Service :...

 when after being mustered in at Alcatraz, they were ordered on October 19, 1862 to Camp Lapwai near the Nez Perce Agency. Joined there at the beginning of November by Company "F", 1st Oregon Volunteer Cavalry Regiment

1st Oregon Cavalry

The First Regiment, Oregon Cavalry was a regiment in the volunteer Union army that participated in the American Civil War. With many men recruited from California, the regiment primarily served to protect the state of Oregon and surrounding territories in the Pacific Coast Theater of the American...

, they built their encampment, Camp Lapwai (that was later renamed Fort Lapwai

Fort Lapwai

Fort Lapwai , a Federal fort now in the Nez Perce National Historical Park, was originally called Camp Lapwai until 1863. It was located on the left bank of the Lapwai River three miles above where it joined the Clearwater River...

 in 1863), in what would become Idaho Territory

Idaho Territory

The Territory of Idaho was an organized incorporated territory of the United States that existed from March 4, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as the State of Idaho.-1860s:...

when it was created the following March.

Garrisons

• Company E, 1st Regiment Washington Territory Volunteer Infantry October, October 1862 - June 1864
• Company "F", 1st Oregon Volunteer Cavalry Regiment, November, 1862 - May 1865.