After months of reverses, the Union army was going on the offensive in
the spring of 1862 as General McClellan prepared for his Peninsula
Campaign.
In Tennessee, General Grant had just captured Ft. Henry and Ft.
Donelson; and in southwestern Missouri, Gen. Samuel R. Curtis had driven
Sterling Price and his Missouri State Guard out of the state and into
the arms of General Ben McCulloch's Confederate army in northwestern
Arkansas. Using the united armies of Price and McCulloch, the new
Confederate department commander, Earl Van Dorn, struck back at Curtis'
Federal army which was now outnumbered and two hundred miles from its
supply base. For two days in early March 1862, the armies of Van Dorn
and Curtis fought in the wilds of the Ozark Mountains at a place called
Pea Ridge. Control of northern Arkansas and southern Missouri for the
rest of the war hung on the outcome.