The western Virginia campaign, also known as operations in western Virginia or the Rich Mountain campaign, occurred from May to December 1861 during the American Civil War. Union forces under Major General George B. McClellan invaded the western portion of Virginia to prevent Confederate occupation; this area later became the state of West Virginia. West Virginians on both sides would fight in the campaign while a Unionist convention in Wheeling would appoint their choice for a Unionist governor for Virginia, Francis H. Pierpont, and promote the creation of a new state in western Virginia. Large scale Confederate forces would gradually abandon the region, leaving it to small local brigades to maintain hold on southern and eastern sections for much of the war.

The Restored Government of Virginia was the Unionist government of Virginia during the American Civil War (1861–1865) in opposition to the government which had approved Virginia's seceding from the United States and joining the new Confederate States of America. Each state government regarded the other as illegitimate. The Restored Government attempted to assume de facto control of the Commonwealth's northwest with the help of the Union Army but was only partly successful. It raised Union regiments from local volunteers but depended upon recruits from Pennsylvania and Ohio to fulfill its commitments. It administered this territory until, with its approval, the area became part of West Virginia in mid-1863.