After suffering a tactical defeat at the First Battle of Kernstown, Jackson withdrew to the southern Shenandoah Valley. Union forces commanded by Brigadier Generals Robert Milroy and Robert C. Schenck were advancing from what is now West Virginia towards the Shenandoah Valley. After being reinforced by troops commanded by Brigadier General Edward Johnson, Jackson advanced towards Milroy and Schenck's encampment at McDowell. Jackson quickly took the prominent heights of Sitlington's Hill, and Union attempts to recapture the hill failed. The Union forces retreated that night, and Jackson pursued, only to return to McDowell on 13 May. After McDowell, Jackson defeated Union forces at several other battles during his Valley campaign.