Question: Which region is this tribal group from who fought against the United States Army alongside Palus, Schitsu'umsh (Coeur d'Alene), Spokan, and Yakama warriors at the Battle of Spokane Plains?

Context paragraphs:
Coeur d’Alene Casino: The Coeur d’Alene Casino is a Native American gaming enterprise run by the Coeur d'Alene people in Worley, Idaho, United States.  The resort includes two hotel towers, the Circling Raven Golf Club, multiple restaurants, and 100,000 square feet of casino floor space.  The Coeur d’Alene Casino is currently one of the largest employers in the Idaho region.

KICR: KICR (102.3 FM) is a radio station broadcasting a Country music format.  Licensed to Coeur d'Alene, Idaho, United States, the station serves the Spokane and Coeur d'Alene area.  It is owned by Blue Sky Broadcasting.

Pend d'Oreilles: The Pend d’Oreilles, also known as the Kalispel, are Indigenous peoples of the Northwest Plateau.  Their traditional territory was around Lake Pend Oreille, as well as the Pend Oreille River, and Priest Lake.  Today many of them live in Montana and eastern Washington.  The primary tribal range from roughly Plains, Montana, westward along the Clark Fork River, Lake Pend Oreille in Idaho, and the Pend Oreille River in eastern Washington and into British Columbia (Canada) was given the name Kaniksu by the Kalispel peoples.

Battle of Four Lakes: The Battle of Four Lakes was a battle during the Coeur d'Alene War of 1858 in the Washington Territory (now the states of Washington and Idaho) in the United States.  The Coeur d'Alene War was part of the Yakima War, which began in 1855.  The battle was fought near present-day Four Lakes, Washington, between elements of the United States Army and a coalition of Native American tribes consisting of Schitsu'umsh (Coeur d'Alene), Palus, Spokan, and Yakama warriors.

Spokane-Coeur d'Alene Combined Statistical Area: Spokane-Spokane Valley-Coeur d'Alene, WA-ID CSA is the United States Census Bureau's official name for the combined statistical area that includes the Spokane metro area as well as the Coeur d'Alene metro area.  The population was 710,946 as of 2016.  It is the 69th largest Combined Statistical Area in the United States, and is the economic and cultural center of the Inland Northwest.  The CSA is Anchored by Spokane, and Coeur d'Alene, which are separated by suburbs that primarily follow the path of Interstate 90.

Coeur d'Alene War: The Coeur d'Alene War of 1858, also known as the Spokane-Coeur d'Alene-Paloos War, was the second phase of the Yakima War, involving a series of encounters between the allied Native American tribes of the Coeur d’Alene, Spokane, Palouse and Northern Paiute against United States Army forces in the Washington and Idaho areas.

Battle of Spokane Plains: The Battle of Spokane Plains was a battle during the Coeur d'Alene War of 1858 in the Washington Territory (now the states of Washington and Idaho) in the United States.  The Coeur d'Alene War was part of the Yakima War, which began in 1855.  The battle was fought west of Fort George Wright near Spokane, Washington, between elements of the United States Army and a coalition of Native American tribes consisting of Kalispel (Pend Oreille), Palus, Schitsu'umsh (Coeur d'Alene), Spokan, and Yakama warriors.

Spokane Valley, Washington: Spokane Valley is a city in Spokane County, Washington, United States, and the largest suburb of Spokane.  It is located east of Spokane, west of Coeur d'Alene, Idaho and surrounds the town of Millwood on three sides.  The city incorporated as the City of Spokane Valley on March 31, 2003.  The Washington State Office of Financial Management estimates the city’s population as 94,919 as of 2015.

Coeur d'Alene, Idaho: Coeur d'Alene ( ) is the largest city and county seat of Kootenai County, Idaho, United States.  It is the principal city of the Coeur d'Alene Metropolitan Statistical Area.  As of the 2010 census, the population of Coeur d'Alene was 44,137.  The city is a satellite city of Spokane, which is located about 30 mi to the west, in the state of Washington.  The two cities are the key components of the Spokane-Coeur d'Alene Combined Statistical Area, of which Coeur d'Alene is the third-largest city (after Spokane and its largest suburb, Spokane Valley).  Coeur d'Alene is the largest city in northern Idaho Panhandle.  The city is situated on the north shore of Lake Coeur d'Alene, 25 mi in length.  Locally, Coeur d'Alene is known as the "Lake City", or simply called by its initials: "CDA".

North Idaho College: North Idaho College (NIC) is a community college in Coeur d'Alene, Idaho, United States, with an enrollment exceeding 6,000.  It is situated at the north end of Lake Coeur d'Alene, at the east bank of the outflowing Spokane River.

Supporting paragraphs: Battle of Spokane Plains Pend d'Oreilles
Answer: Northwest Plateau