Statistics for occurrence #1 of “Stonewall” in chapter 7, page 184 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 10: The Armies and the Leaders.:
... Department of Western Virginia.
On March 29th, Brigadier-General Rosecrans turned over the troops therein to Major-General John C. Fremont.
This force co-operated with Banks and McDowell against Stonewall Jackson in the Shenandoah valley, and its principal engagements were those at McDowell and Cross Keys.
On June 26, 1862, the Mountain Department became the First Corps, Army of Virginia.
...